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It follows reports the Democratic Unionist Party wants £2bn extra funding from a Tory-DUP deal at Westminster.
Mr Jones described such a deal, to give Theresa May a majority in key Commons votes, as the "great power bribe".
Responding, Welsh Secretary Alun Cairns said UK ministers had a "pretty strong record" on funding for Wales.
After the Conservatives' failure to win a majority in the general election, they have been locked in talks with the DUP for support to help them survive as a minority government.
Sources told the BBC on Wednesday the DUP wanted £1bn investment in the Northern Irish health service and a similar figure for infrastructure projects, although a DUP MP called those figures "wide of the mark".
Mr Jones said: "Ah, the great power bribe.
"What we're seeing there is an attempt to provide more money for Northern Ireland and, if I were the DUP, I'd do the same thing.
"But the reality is you can't give more money to Northern Ireland and not trigger the Barnett formula, which would mean more money for Wales and Scotland."
The Barnett formula is a long-running mathematical calculation that distributes money to Wales, Scotland and Northern Ireland.
Mr Jones added: "I think every underhand way will be found to give more money to Northern Ireland at the expense of Scotland, Wales and indeed the English regions."
Welsh Conservative leader Andrew RT Davies has said "any potential incentives considered for one nation... must also be considered for Wales".
But Prof Gerry Holtham, an economist and former adviser to the Welsh Government, said the Barnett formula "works in one direction only" - to ensure spending changes in England are reflected in Wales, Scotland and Northern Ireland - and was "just a convention".
"If the government decides it's going to do a formula bypass, which it's done on many past occasions, that's what it does," he said.
"They will do what they can get away with, basically. If the pressure for fairness is politically significant then they might make some concessions but they really don't need to."
The DUP is also reported to be calling on the Treasury to scrap Air Passenger Duty (APD) in Northern Ireland.
Such powers have already been transferred to Scotland.
Mr Jones, whose Welsh Government owns Cardiff Airport, said: "It's completely irrational that Scotland and Northern Ireland would control Air Passenger Duty, as would England, but Wales wouldn't."
Mr Cairns said the current funding settlement for Northern Ireland was "very different" from that for Wales.
"Wales has £120 for every £100 that's spent in England, Wales has a funding floor that Northern Ireland doesn't have," he said.
"And Wales also has City Deals for the Cardiff Capital Region and the Swansea Bay City Region as well as a commitment to the North Wales Growth Deal - there isn't a City Deal in Northern Ireland.
"So that demonstrates we've got a pretty strong record and I hope that is recognised."
Pontypridd MP and Labour's Northern Ireland spokesman Owen Smith said any Tory-DUP deal had to be scrutinised.
But Westminster politics "can't inhibit getting the peace process up and running" in Northern Ireland, he said.
Speaking on BBC Wales' The Wales Report, he said: "Talking about parity between the sorts of treatment that Northern Ireland gets and other parts of the UK isn't what we've done in the past.
"Northern Ireland is a special case and it will always need special consideration."
Conservative UK ministers will find an "underhand way" to give Northern Ireland more money at Wales' expense, First Minister Carwyn Jones has said.

However, it expects retail sales growth to slow down next year, as a result of the fall in sterling prompted by the Brexit vote in June.
The weaker pound makes imports more expensive and pushes up inflation.
Clothing saw particularly strong growth in sales volumes, while grocers had their best results since January.
This latest CBI Distributive Trades Survey covers the last week of November and the first two weeks of December and included the pre-Christmas discounting day, Black Friday on 25 November.
Hardware and DIY and internet retailers also reported strong growth. Wholesalers saw their strongest growth in volumes for nearly 18 months.
"It's encouraging to see retailers reporting another month of healthy sales growth leading up to the festive season, which rounds off a fairly solid quarter," said Ben Jones, CBI principal economist.
However, he added: "While we still expect to see decent growth in the near term, the pressures on retail activity are likely to increase during 2017, as the impact of sterling's depreciation feeds through.
"With higher inflation beginning to weigh on households' purchasing power, consumption patterns are likely to shift, creating winners and losers across the retail landscape."
Wholesalers reported the strongest growth in volumes for nearly 18 months in the year to December.
Last week's official retail sales figures showed volumes jumped by 5.9% in November compared with the same month last year as shoppers took advantage of Black Friday discounts.
But higher fuel costs meant the rise was not as strong as in October, when annual retail sales growth hit a 14-year high of 7.2%.
UK retail sales volumes rose at their fastest pace since September 2015 in the year to December, according to the employers' organisation the CBI.

Campers and hikers have long known the misery ticks can cause.
Now scientists at the Roslin Institute aim to find new ways to prevent diseases transmitted by the tiny insect-like creatures.
The university will establish the Roslin Wellcome Trust Tick Cell Biobank with the funding from the Wellcome Trust.
It says the biobank will house the world's largest collection of tick cell lines, enabling scientists to carry out advanced research.
The scientists hope to understand how viruses and bacteria, which are transmitted by ticks and which cause a range of human diseases, can survive for long periods of time within ticks without damaging them.
In parts of the world, ticks can transmit a number of severe and potentially deadly diseases to humans and animals, including Lyme disease, tick-borne encephalitis and Crimean-Congo haemorrhagic fever.
In Britain, cases of Lyme disease are dramatically increasing each year.
In the rest of Europe, tick-borne encephalitis is now endemic in 27 countries, including Germany and Croatia.
Tick numbers are surging in Europe and scientists warn that changing climate patterns and increasing globalisation could enable them to spread into new areas.
The Tick Cell Biobank team and collaborators from seven other European countries have received further funding from the European Union to train a new generation of scientists specialising in ticks and their related diseases.
Project leader Professor John Fazakerley said: "Tick-transmitted infections are likely to be increasingly important in the future. Understanding these diseases and training scientists to undertake research on them is important for both human and animal heath".

Scientists at Edinburgh University have been awarded £2.5m to tackle the growing health risk posed by ticks.

