As one of its daily deals, CowBoom offers the used iPad Air 16GB WiFi Tablet in Space Gray, model no. MD785LL/A, for $249.99 with free shipping. That's $149 under our mention of a new unit from two days ago (which included a $100 gift card) and the best price we've ever seen for an iPad Air 16GB tablet. (It's also $129 under the lowest price we could find for a new one today.) Deal ends today.
Note: No warranty information is provided. Also, these are used items and may have scuffs, surface scratches, dents, or other cosmetic blemishes, and may be missing parts/accessories.