IBD Electronics via Amazon offers Prime members the Incase HardShell Case for 13" MacBook Air in Raspberry for $14.41 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, it adds $8.58.) That's $3 under last week's mention and the lowest total price we could find for any color by $26, outside the price below. It features a rubberized soft-touch coating, thermal vents, rubber feet, and accommodates the latest Apple 85-watt MagSafe Power Adapter.
A close price: Groupon offers a wider selection for MacBook Air 11" and 13" in six colors for $12.99 plus $3.99 for shipping.