Learning refinishing on a good gun is probably not a good idea. It's best to practice on junk and scrap metal.
Now, without getting into a treatise on how to refinish guns, you could probably get your gun blasted and Ion-Bond coated for under $300. This is about the toughest black finish there is.
Any professional refinish is going to cost almost as much as the gun is worth, so you might as well get the best. Contact Chad Buie at Club Customs 336-596-0045.
I'm not saying you have limited skills, but refinishing requires buffers, belt grinders, sandpaper, rotary tools, a blasting cabinet, air compressor, and cleaning equipment. This is just for the metal prep. Then you have to be set up for Parkerizing or painting.
It's just not cost-effective to refinish guns at home. I know that you see guys telling you how good their cold bluing job came out, but those home jobs can be spotted across the room. Almost any finish you can do at home will be substandard. Rust bluing is the exception-but you don't want bluing. Parkerizing can be done at home if you can do the metal prep, but it is no better than bluing.