Walmart offers the Apple iPad mini 2 w/ Retina Display 16GB WiFi + 4G Tablet for AT&T in Space Gray, model no. MF066LL/A, or Silver, model no. MF074LL/A for $329.99 with free shipping. That's $50 below our August mention and the lowest total price we've seen for these models. (They're a current low by $99.) The tablet features an Apple A7 1.3GHz 64-bit processor, 7.9" 2048x1536 Retina display, FaceTime HD front-side camera, 5-megapixel iSight camera, 802.11n wireless, Bluetooth 4.0, Lightning connector, and 10-hour battery life.

Update: It's now available for in-store pickup only.