Where can I purchase an iPhone 4, 4S, or 5 for a reasonable price?

I have T-Mobile and since they don't sell it and I Really want an iPhone, does anybody know a reliable website or store in the Chicago area I can buy one for a reasonable price?

Amazon! <

Just buy it on ebay make sure it is factory unlocked. Just enter "iphone 4 16gb factory unlocked"
or try this store in chicago:
Overseas Electronics
2457 W. Devon Ave. Chicago, IL 60659, USA

Also there are a bunch of store in that area on Devon ave.selling unlocked phones!

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