Where to buy an iPhone 4S (unlocked) cheap for T-Mobile?

So my family is switching to T-mobile & we want to get an iPhone. 4S because it's cheaper.
I'm in Southern California & I've looked all over Craigslist & eBay for a cheap iPhone 4S.
I'd expect it to be around $100-200 (16GB) since 5 came out.
Where can I find a cheap one?

Dhahdf

EBay

IPhone 4S' are $100, so first go buy one from Verizon/AT&T/Sprint. (if you want a cheaper one and do not care about getting a used iPhone 4S, order it from online)

Then, go to T-Mobile to unlock it. T-Mobile does not sell iPhone's, but they unlock it so you can have T-Mobile coverage.

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