I picked up my 04 Pro for $470 on Ebay. I got lucky because the seller listed it as just a "Langster" though so I didn't have many bidding opponents. I just knew what it was based off the description and pictures. It's an amazing bicycle and, as I've stated before, I would immediately start searching for another one if this one were stolen or crashed/destroyed.
As a side note, I had it weighed a couple weeks ago and with its current setup (Specialized Pave seatpost, Specialized Alias 143 seat, Deda 215 bars, Easton EC90 stem), it came in at only 15.64lbs. With those components and only weighing that much, it gives a softer and faster ride than my Surly Cross-Check, easily...