How much does iPhone 4s cost in the USA?

Without a plan or contract. Unlocked to the worldwide because I want to use it outside the states. And will it still be a good phone in 2-3 years?

I bought mine for like $300 back in April 2012 before the 5 came out. You can probably get one now for less than $100. You'd have to talk to a phone provider for international use

It's going to be at least $600 US Dollars. At that is for a sixteen GB one. It is a very reliable phone as well. Apple always releases update for it's software. I know many people with the last generation iPhone who won't upgrade because they love it.