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Generally a small tank leak, some soil, testing, reporting ect can run up to the $5,000.00 range. Costs can incrementally increase by thousands of dollars based on the increase in soil removal (contaminated soil) and replacement (clean fill). Could you spend $7000.00, $10,000.00 or more, yes, if the tank leak is big enough to require that expense.
Your situation in your area will change the economics of getting oxygen. The tanks are almost never lifted. They are rolled by tipping slightly and rolling along on the edge of the bottom. K-tanks are the most cost effective to refill mostly because they are the most used size. Here in the Seattle/Tacome area a K-tank costs about $190.00 to buy. I don't know the rental cost. I pay $14.00 per tank to refill and that's on a 'lampworkers/glass blowers' account that is used by a bunch of people all unrelated/unknown to each other.