Walmart offers the Apple iPad with Retina Display 64GB WiFi + 4G Tablet in White, model no. MD518LL/A, for $569 with free shipping. That's the lowest price we could find by $211. This 9.4mm thick tablet weighs 1.4 lbs. and features a 9.7" 2048x1536 Retina display, A6X dual-core processor with quad-core graphics, 5-megapixel iSight camera with 1080p video recording, 1.2-megapixel HD FaceTime camera, voice dictation, 802.11n wireless, Bluetooth 4.0, Lightning connector, up to 10 hours of battery life, and iOS 6.

Orders placed by December 19 will arrive by Christmas.