http://www.ec21.com/ec-market/hydrofoam.html

is a list of manufacturers, they are all in China or Hong Kong.

So people are buying from these guys and then selling them on eBay.

That's why no one has any parts, I just found a motor for $65 plus shipping, which is probably going to be at least $10.

Well I just bought a whole plane for $110 that includeds shipping.

here are some tips,

cut up the inside of floppy discs to make great hinges and protectors for the float bottoms.

or Overhead projector transparencies.