Sucks to be you then? You won't be able to just buy a brand new Nextel phone without a contract, short of going to Nextel and shelling out big bucks for it. Gotta be realistic, the phones themselves are pretty expensive, only reason they're cheap to get is because you sign the contract. Any place you find that sells new phones without activation/contract will be charging at least $250+
Amazon has Nextel phones on there, browse through and look at them, phones that cost $125 with a 2 year service setup are almost $400 without it. That's about what you'll be paying for a brand new one, anywhere between $200-$500 or so, depending on the model.