Given my almost nonexistent income level, I've built almost everything that I've wanted from **** lying around. My 'Alien' costume, for instance was made out of welding rod, an old baseball helmet, a motorcycle helmet tinted visor, the brass gear from a Mechano clockwork motor, the spacing rack from a 1920 Smith-Corona typewriter, a magnetic cupboard latch, the 6-way power seat motor pack from a '72 Mustang, a deep-sea wet suit, a couple of bevel gear that I think came from another typewriter, an electrical junction box, a small hinge, an angle bracket, a SPDT micro toggle switch, four springs from paintball guns, a welding helmet support web, part of a garage door rail, a couple of mainframe hard drive (circa 1980) bearings, some pop rivets, the seatbelt housing from a mid 70's Buick, some store-bought fake teeth (Hallowe'en vampire crap), some sheet steel, a couple of other springs from the aforementioned SC typewriter, a bunch of red and white elastic threads, a couple of ounces of liquid latex, and some petroleum jelly.
That was just the head. I don't want to discuss the rest of the body, including the air conditioning system, tail drive, etc. at this point. The only expensive part of the outfit was the 12V6Ah gel cell battery that ran the thing. That cost me about $75.