Oh good grief, it's not even fair sometimes. I buy almost all of my gear (other than wetsuits) used.
Let's see DUI TLS350--$200 with new wrist and neck gaskets. (best deal I've gotten so far...)
3 AL80s for $50. (needed hydro and vis though so not an "OMG" price)
A Scubapro Mk10/G250 with OCeanic Omega spare and oceanic console w/computer and Genesis Phantom jacket BC for $325. (Not a great deal but a decent one.)
AMF/Voit MR12 II reg, Seaquest BC, Dacor Reg and Dacor spare, Dive flag, mask and fins, $40
Mares quattro fins, mares mask & snorkel, with bag and other spare accessories $30.
Another 5 or 6 BCs, including a horse collar I converted to be my wing for a total of about $40.
Saekodive mask, fins, snorkel, and bag $20 or $25 new.
Oceanic Veo180 for something like $150 including the "navi" swivel console with compass. I don't remember the exact price but it was here on classifieds and a fair deal if not a fantastic price for me. (Gave the console to my brother and kept the computer for myself.)