Amazon offers the Logitech K780 Multi-Device Wireless Keyboard, model no. 920-008149, for $59.99 with free shipping. That's the lowest total price we could find by $8, although most stores charge at least $72. It's compatible with Windows, Mac, Chrome OS, iOS, and Android, and features a USB receiver, Bluetooth, integrated phone/tablet stand, and up to two years of battery life.