For $6 you can get a shotgun belt and a few tubes. Seriously, wally world or cabelas sells shotgun belts for $4, grab one, that will hold 25 10 round tubes or 12 grams, and 10 round tubes are like 10 cents each or something, I don't know... they're cheap. Get the change under the couch, and you're set.
Unless you need a marker. Then you need more money