Macondas -
Price Western catalogs one, and I think Bianchi and DeSantis do also. Each manufacturer also has a belt slide, Yaqui slide, style rig for the full size USP. The compact and full size are the same through the slide area, so a non- full length holster should work for either.
Do not forget some of your semi custom or custom makers: Sparks, Kramer, Murnak, Rosen, and MD Custom Holsters, just to name a few. I beieve all have a website you can check on I am sure there are others.
Oh yeah don't forget the Kydex makers out there: Blade Tech, Springbok, and Scott Evans shop. I can't remember the name of Scotts shopt offhand, but he is on this forum a lot since he moderates it!! Also Jim Murnak and MarkTHG of MD Custom Holsters post here with links.
Anyways hope this helps.
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