I usually ask US$300 or $700 and they almost never reply back. They want it for $50...they must be smoking crack. But I did sell one for $7000, another for $2500 and another for $1500...not bad for 5 minutes of typing. Usually the high value ones were accidentally someone's company name, and they HAD to have it, like widgetlink.com, or widgetsoftware.com etc.
You could also try the domain auctions, although I never got any action from them, personally.
[bc.edu...]