Hisgadget via Amazon offers the iClever Tri-folding Magnetic Control Bluetooth Keyboard, model no. IC-BK03, for $36.99. Coupon code "D2MTPWOW" cuts that to $27.99. With free shipping, that's $72 off list and the lowest total price we could find. It's compatible with iOS, Android, and Windows systems, and features a rechargeable battery, 33-foot wireless range, and auto power on/off.