Can i buy an iphone online and use it for sprint?

Someone stole my iphone, so i'm using my blackberry temporarily. They told me i can get a new one at full price. I'm not paying how much it is. Can i buy the 4s from apple.com for $100 sprint and have it activated?

Yeah you should be able to

No you can't buy the $100 version from apple and use it on your current account. However you can buy it, it requirrs new 2 year agreement. If you do not want to add a line to your account, I would suggest looking on Craigslist or similar sites for a iphone 4S, but make sure it has a clean ESN. If you are dur for an upgrade, the $100 price could be available. Go to your local sprint retailer and ask for you upgrade eligibility date.