Rebar bottle openers are an easy practice piece that (a) you can sell or trade for favors or material and (b) don't require tongs to make. Just take a two-foot (or longer) piece of rebar, slit and drift the hole, shape the ring, punch the tab, and cut off the parent stock. Make some more. Sell 'em to your friends at school for five bucks each. If you sell four, that's enough to get you a tong kit from Ken's Custom Iron (you'll need to do some shaping and riveting, but it's a lot easier than making them from scratch).