Peil Frama does have a case for the XDA III already. Its available through expansys right now. Its called the chairmans case.

I also hear that an aluminum and crystal case might be coming from proporta pretty soon too.

Tuff-as-nuts.com also has a leather case for this too. Not a flip, but a pocket that attaches to your belt. You would have to take it out for operation. However, with bluetooth that might not be neccessary to just handle phone calls.