I use this one from Verizon and love it. Case is slim when not in the holster, slides in front facing, slides in/out easily and even has a built in kickstand. Good stuff.
Shell/Holster Combo
Edit: Ooops, just noticed the 'no cace' requirement. Sorry. This is still a slick case/holster combo. Very slim.
I have an extra Verizon Case/Holster that I will sell for $10+ship. List is $29...Same as the one Joggy posted above..There is a company that makes one. I'll try to remember the site. Off the top of my head I wanna say htcpedia but they made 3 different holsters and one was for a caseless phone
EDIT: Seidio makes it but it might only be available in EU at the moment
I just received my Seidio Surface case and I love it. I had one on my Droid, and it did a great job. The Surface consists of two halves that slide together and lock securely. If you've never handled a Surface, it's somewhat difficult to describe the feeling, which is somewhere between a silicone case and a glossy plastic case. The matte finish has enough "traction" to keep from sliding on a smooth surface, although not as much as a silicone or rubberized case. Cutouts are precise and accurate and the case adds little bulk to the phone. All things considered, it's perfect for me.I have an extra Verizon Case/Holster that I will sell for $10+ship. List is $29...Same as the one Joggy posted above..
I've used it for a few days and it still looks brand new. I decided to go with the Incipio Silicrylic.