Walmart is rolling back prices on every in-stock iPad 2 and Retina 4th generation iPad while supplies last. This deal nets you a 16GB WiFi iPad 2 for just $349 (13% savings) or $449 (10% savings) for a 4th generation iPad.
We typically see a couple $50 price drops over the course of a month (typically as an eBay Daily Deal), but a sizable discount for iPad 2 is certainly much more rare. Jumping up to a 4th generation iPad will get you a beautiful Retina display, faster A6X processor, the new Lightning connector and other performance bumps. If you can get by without those upgrades the iPad 2 is still a capable tablet.
Sale prices are available for multiple storage capacities, colors, and WiFi/cellular models. Browse the entire selection here.