Where can I buy a Cheap unlocked iPhone 5C?

I'm willing to sell my jailbroken 4s and buy a iphone 5c. But I want one under $200 unlocked or locked to the Cricket netwrok.

What you want is irrelevant. Used iPhones are commodities and have very predictable pricing based on which exact model they are, the memory capacity, whether unlocked or not and the condition of the phone. The only other factor is whether purchased via a trader with a warranty or purchased sold as seen from a private seller.

So if you've searched and can't find one within your budget then you're being completely unrealistic and either have to go for one in a really poor condition or go for an older model.

To be honest, upgrading from a 4s to a 5c is such a minor upgrade as to be nearly pointless. The original 5 and the 5c are basically a 4s with a slightly larger screen and a slightly faster processor. But the 5s is almost a 6 with a slightly smaller screen and a slightly slower processor. It's a definite upgrade on what you have.

Wait a few months until the new iPhone comes out and all used models will fall in price.