Speck PixelSkin HD case for iPhone 5 at @ Unique Mobiles shipped for $9
While running a quick price check on these I saw an interesting deal for the Speck PixelSkin going at iCoverlover.com.au. The cost of one including delivery is $17.64, which is the next best price I could find, but you'll also get two free gifts: an Ultra Crystal SGP iPhone 5 screen protector and a splash resistant smartphone bag. Some might find the extra $8.64 worth the spend to get those two additional items.
Elsewhere I found the Speck PixelSkin going for $29.95 from Myer and the Apple Store, and $38.90 from Mwave. Prices including delivery.
The PixelSkin HD provides a flexible casing design that offers protection which is durable, yet light, and pops on and off in a snap.