Where to buy an iphone 5s for $550?

I live in Miami and am looking to buy an unlocked iPhone 5s for $550 because I can now use an iPhone 5s with metro pcs by buying one unlocked and using their SIM card. Metro sells the 5c but I prefer the 5s. Does anyone know any RELIABLE sites and stores that I can buy one. And if it's an actual store it must be in the Miami area.

Yes and no.

Yes at Apple. Both online and the three stores in the Miami Area.

No you won't be able to get it for $550. The cheapest iPhone 5s unlocked is $649.00

Online -

http://store.apple.com/...e/iphone5s

Physical Stores -

Apple Store Dadeland
7535 Dadeland Mall
Miami, FL 33156 (305) 341-9812

Apple Store The Falls
8888 SW 136th Street
Miami, FL 33176 (305) 234-4565

Apple Store Lincoln Road
738 Lincoln Road
Miami Beach, FL 33139 (305) 421-0400