I use the Boom-Mate as well. Interestingly enough, several years ago I was in a Walmart and noticed they had these fishing pole holders that were on clearance for like $8 or something. They were exactly the same as the Boom-Mate but with a threaded base. However, I've not seen them since. It's worth a shot though to check the Wally world in your area to see if they have them.
C-stand or combo stand, grip head and a boom mate is what you need.