This one looks like the same model--and there's a dual receiver version. iClever and Pluggable have some good ones. iClever has backlit versions, and both Bluetooth and USB receiver models. This one is a bit different.

This keyboard is ultraportable and has a USB connection mode.

You can always make your own USB keyboard using a teensy microcontroller and instructions from around the web. Massdrop sells kits every now and then.