Tanga offers the refurbished Unlocked Apple iPad mini 2 16GB WiFi + 4G Tablet w/ Retina Display in Silver, model no. MF075LL/A, or Space Gray, MF069LL/A for $219.99 with free shipping. That's $60 under the lowest total price we could find for an unlocked open-box unit and the best price we've seen for a WiFi + 4G iPad mini 2. (New locked units cost $429.) This unit is unlocked for GSM carriers and also works on Verizon.

Note: A 30-day warranty is included, but it's unclear who backs it.