Here's an odd one: a "JL421 Badonkadonk Land Cruiser/Tank" for $20k. It actually just looks like the bottom half of a dalek, but apparently it's got a 6hp Tecumseh, good for 40mph. Not bad, for something that can allegedly carry 5 passengers into battle.
And yes, I know, that's a burning man art car. But it's still a bizarre thing to find on Amazon.