http://www.sevenstring.org/forum/gear-for-sale-trade-wanted/83609-fs-mesa-boogie-dc-5-combo-in-wine-red.html
The guy bought it here from another BB member.
You could probably talk him down a little. I think that $900 is high.
They used to go for around $500-$750 or so depending on condition.
I don't think I would spend a whole lot more for one unless it was in mint condition and had brand new tubes and filter caps.
I see them at Guitar Centers sometimes too. Anytime I go to the city, I visit the local Guitar Wal-Mart's used section. They always seem to ask for $800 or more, but I bet they don't sell them for that.
I've bought them for as little as $500 in crappy condition, and as much as $750 in really decent condition. But...I haven't bought one in a long time, so I don't know if these prices are still good.
I PM'd you with information about mine.