Oh, I am a real dumpster-diver...
* The office chair that I am sitting on.
* I am rebuilding the undercarriage of my Phantom case with plastic pieces cut from this and that.
* I have built a few shelves and a cabinet out of "reclaimed" furniture, floorboards and window blinds.
* About a dozen picture frames... until I decided to collect only frames that match.
* Leather I have reused for costumes.
... and lots more
No interesting keyboard, though ... yet. Only a Key Tronic foam-and-foil, but a person here got the sliders so it wasn't for nothing.
I am also a frequent visitor to flea markets and thrift stores. Keyboard finds so far: first-generation Goldtouch, HHKB Lite 2, Key Tronic ErgoForce, MS Natural Keyboard Pro. I keep hitting myself for the time that I passed on a Triumph-Adler typewriter with nice keycaps...
Most of all, though, I buy a lot of sci-fi books and DVDs at flea markets.