Interested in the AA battery powered Apple wireless keyboard? I would have to check the specific model I have but it would be something like this :
https://en.m.wikipedia.org/wiki/Apple_Wireless_Keyboard
The only sales on this (that I am aware of) have been through Green Man Gaming. If you sign up for their newsletter they frequently send you a coupon to get it for around $21. I had no problems with the transaction - key was delivered instantly.