inexpensive?
Get some Kydex and make your own. I use a homemade Kydex holster every day for my Sigma. I made it in about twenty minutes. I heated the plastic in a toaster oven and used garden gloves to protect my hands while I shaped it. Any spot reheating I needed to do I did with a standard propane torch, such as heating the area around the trigger guard so that I could depress it resulting in a 'spring clip'. Just remember to make a little jig out of a pencil or something of the sort to lay on top of the barrel to create a grove for the front sight to travel in.
As for securing the kydex together on the side opposite the fold, I used rivets. A lot of guys say you can use PVC glue, but I've seen their knife holsters come apart at the seams under use.
