TechRabbit offers the refurbished Logitech Ultrathin Bluetooth Keyboard Cover for iPad mini in Black, model no. 920-005021, for $19.99. Coupon code "AFKYBRD17" cuts the price to $17.99. (Deal.Fisher via eBay offers it for the same price.) With free shipping, that's $19 below our April mention of a new one in another color and the lowest total price we've seen for this item in any condition. (It's currently $21 less than you'd pay for a new one and the best price we could find non-new by $8, excluding the below mentions.) This aluminum keyboard features Bluetooth connectivity, iOS shortcut keys, a smart hinge, and rechargeable battery that provides up to three months of power on a single charge. Deal ends September 14.

A 90-day TechRabbit warranty applies.

A close price: Hotdeals4u via eBay offers it for $18.58 with free shipping.
Another close price: Closeout_Goods123 via eBay has it for $18.88 shipped.