The Spider is made from spark plugs, push rods, a lifter, a sprocket, bearings, and other things.

The spider is $30.

These Scorpions (below) can stand alone or can be hooked together to fight. They're made from spark plugs, screws, square nails and other things.

Scorpions $15 each or $25 for the pair.

Space Bugs are made of horseshoe nails and wire.

Grasshoppers (below) are made of staples, bolts, wire, and nuts.

Space Bugs and the grasshoppers range from $7 to $10.