he uses a Boss CS-2 right now, and used a MXR Dyna Comp in the '80's. Both are discontinued I believe. You should be fine with a Boss CS-3 though, which are around 80 bucks a piece
I thought he used both compressors? MXR has re-released a version of the Dyna comp. And if you absolutely have to have the CS-2 then I'm sure Evilbay and its ilk will offer you plenty.