I spent 6 months checking the Ma. K. listings every night to get those.  So I might not have paid much, but I put in the time to get them.  The key to ebay is patience!  And to refuse to bid more than a set amount.  Just wait, unless it is very rare, it will turn up at a low price sometime.... 

I do have one Dust model, that might get into the contest.....But it all depends upon the rules, and how much time I have.  My stash is so large that I could build almost anything.  Plane, car, tank, space ship, but no boats, or ships, unless you count the space ship Yamato.