What to look for when buying an unlocked tmobile iphone?

Wanna get an iphone but i'm on a family plan and they have Tmobile (and won't switch) so i was looking on ebay for an Unlocked iphone 4s. But was wondering what are somethings a should look for and keep in mind such as prices condition, etc. So i don't get ripped off or pay to much?!

You can get an IPhone 4s unlocked from carriers, 99 $

http://store.apple.com/...y/iphone4s

I'm now using T-Mobile with my iPhone. You can unlock your iPhone at: http://www.iphonefort-mobile.com/

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