http://www.amazon.com/Microsoft-Universal-Keyboard-Android-devices/dp/B00GWGLUZ0/

Pairs with 3 devices at once. Has built-in battery, charges via microUSB. Closes for easy transportation. Compatible with anything that supports Bluetooth (iOS, Android, Windows, Mac). Like new and works perfectly - I bought it new and have only used it once.

Costs $80 on amazon http://www.amazon.com/Microsoft-Universal-Keyboard-Android-devices/dp/B00GWGLUZ0/ - I can offer it to you for $55. You can pick it up on campus. Cash or venmo both ok.