Are you talking about the Freedom Slim Keypad? That looks like it *might* be okay. OTOH, if it's $100, I'm going to keep thinking about a case that will just hold my folding BT keyboard.
I forgot to mention: anyone making a keyboard gets bonus points if there's a decent way of getting a Meta key (as well as control). This is a Unix device. I'm still outraged it can't run emacs... :-)