Walmart is offering the Justin Power Rechargeable Power Case for Apple iPad 2-4 and 10″ tablet for only $9.99 today. Although designed for the iPad, it should also work for larger 10″ tablets.
The USB port on the side can be used to charge any USB device with the included micro USB power adapter. It can charge an iPad up to two times and an iPhone up to 7 times per charge. The synthetic leather case helps protect your device but still allows you access to buttons and ports.
Pick up your order at your local store to avoid the $4.97 shipping charge.