With a 30- or 55-gallon oil drum, you can build your own charcoal grill, tandoor oven, or smoker. All you need is a clean, rust-free oil drum (good luck), some hinges, metal legs and some racks (salvaged from an old stove, perhaps?). Bessey says "find someone to safely cut the barrel for you" lengthwise, put in the hinges so you have a clamshell, add the legs at the ends, and drop in the racks. You'll need some holes for ventilation on the ends, and you're ready to grill.
Makes you kind of wonder - are those $1000 brushed steel rigs really worth it?
If you're feeling really ambitious, here's a guide to building your own Big Baby Double Barreled BBQ.