I would call this a fixed unit price or fixed unit rate contract, under the general heading of fixed price, because the price is ...not subject to any adjustment on the basis of the contractor's cost experience in performing the contract.. FAR 16.202-1.Just my $0.02 worth. fixed rate and fixed price can be one in the same. Certainly there are contracts with fixed rates. I would usually refer to those as unit-priced items, as opposed to lump sum priced items. And there is no prohibition in including a not-to-exceed quantity of a unit-priced item.
The best way to store herbs is to wrap them in a wet paper towel and put them in a plastic bag in your fridge. My rosemary, thyme, and parsley lasted for a month and was still fresh. I recommend this method.
Fresh spices will only be good for about a week, unless it is garlic. Fresh garlic can be kept for four to six months before it is time to get a new batch. That doesnât totally solve your spice shelf life woes, though. If you buy spices that do not come with a label, create your own with the date you bought it so that you can keep track of how long spices have been hanging out in your cupboard. Always store herbs and spices in tightly sealed containers in dry, dark places.