One way to buy this stuff is to attend a MAJOR triple elim F2D contest. Some guys fly into the contest, then sell their left over planes in lieu of shipping them home.
Sounds strange to the stunt flyer, but F2D'ers don't have a love affair with their toyes. There are minor improvements year-to-year and some prefer to sell the current models and order the new revision over the winter.
Personally, I'm still dabbling with four engines & twelve planes I bought in 2008. $2,500 doesn't make you a winner, but it sure gets you into the game.