Newegg offers the refurbished Logitech Keys-To-Go Bluetooth Portable Keyboard for iPad in Black, model no. 920-006936, for $14.99 with free shipping. That's $5 under our October refurb mention and the lowest total price we've seen. (It's a current low for a refurb by $10.) This 6" x 10" x 5" keyboard is compatible with all iPads.

A 90-day warranty applies, although it's unclear who supplies it.