Qualitycellz via eBay offers the refurbished Logitech Ultra Thin Keyboard Cover for Apple iPad Air in Blue, model no. 920-005985, for $14.99 with free shipping. That's $15 under our mention from last June and the best price we've seen. (It's also a current low by $15 for a new one.) It features magnetic clips, toggles the iPad Air's sleep/wake function, and recharges via USB.
Note: No warranty information is provided. There may be some signs of wear and tear.