You MIGHT be able to buy one for what it will cost you in materials and learning time, depending on what you really want. You could look for a saddle holster
that you would then modify to wear. Ranchers frequently carry very large pistols when out and about to fend off coyotes, snakes and so forth, these pistols are too big and uncomfortable to wear, so the holster straps on to the saddle, like so: http://www.oldtradingpost.com/old-we...7ba21ff5689003
(that looks about an average price too).