Mobile Pros via eBay offers the Unlocked Apple iPhone 4S 16GB Worldphone for GSM Networks in Black, model no. MD234LL/A, or White, model no. MD237LL/A, for $299.99 with free shipping. That's $199 under our March mention and the lowest total price we've seen. (It's also the best deal we could find today by $62.) It's compatible with GSM networks such as AT&T, T-Mobile, and Vodafone; it can't be used with CDMA networks such as Verizon or Sprint.