Around here (NC) usually nice full tall ones go for $80 and up - not sure if that's a regional thing? But you can usually get an inexpensive 5' one or so at the grocery store for $30 if you want.
Sometimes the places around here will start to negotiate around the 20th, moreso closer to Christmas. I don't know what they do with any leftover trees, but the places are always gone the day after Christmas it seems.
at 2:15 PM on Dec. 1, 2011