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.