I just got two OEM silicone skins on eBay for $6 each and free shipping. One of the users was oemforcheap and the other I bought from was from unlimited cellular. They're the same ones in the CB store.
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I bought a magenta one from bargaincell for around $5 after shipping costs. I got it through amazon - they have a lot around that same price. As others have stated, if you want a particular color, you may want to contact the seller directly. Mine was supposed to be light pink, but after considering how little I paid for it and what it would cost to send it back, I kept it.
