Those KO combiners suck. I bought a set of Constructicons at Walgreens last year, and it was the worst $6 I ever spent. None of the figures fit together, they can barely transform, and you can feel the lead in the plastic on your fingers.
That's why I'd gladly pay $95 to BBTS or any other importer for a nice reissue set. I haven't seen any individual piece of a vintage Devastator sell for less than $15-20 a piece, though I'll admit I haven't looked for a while.