I stopped at the local CD Warehouse this morning. I bought about a half dozen used CD's for $2.99 and $3.99. I told the girl that I was impressed with the prices there for used CD's. She said she is getting ready to mark down the rest of the used CD's for the same prices.
I don't know if this is true for the CD Warehouse in your area, but it sure impresses me.
BTW, CD Warehouse is connected to half.com.