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I think many carpet/flooring stores display the price per square foot (installed) on their displays, probably the easiest thing to do is go somewhere like that and check out the prices on carpets that appeal to you. There's going to be a big difference depending on which carpet you like.
There is a Mill End store about 1/2 hr from me and it has remnants and discount carpet on a roll. Real quality stuff among what is offered. Look around for something like that. If the room is not too large maybe a rem. of good stuff can be found.