Amazon offers Prime members the Logitech K480 Bluetooth Multidevice Keyboard in Black for $23.50 with free shipping. That's a buck under last month's mention and the lowest price we could find today by $6, excluding the mention below. It can connect to up to three different Bluetooth devices and features 81 keys, a wireless range of up to 30 feet, and USB charging cable.

Note: Best Buy via eBay has it for $24.99 with free in-store pickup.