Apple has recently listed refurbished 4th generation iPads and iPad Minis on the Apple store. The currently listed 4th gen iPads with Retina Display are the 16 GB black for $449 ($599 new) and 16 GB w/ cellular in two colors – black and white – for $579 ($629 new.)
The currently listed iPad Minis are the 32 GB black & slate for $389 ($429 new) and 16 GB w/ cellular in two colors – black & slate and white & silver – for $429 ($459 new.) I don’t think these are great deals, but it seems like a few models have sold out since the listings went live.
All refurbished iPads have a new battery and outer shell. They are tested and certified to operate and carry the same 1-year warranty offered with a brand-new iPad.