I just picked up an HD tuner (Accurian HTS 6000) at Radio Shack on clearance for $89, down from $249! It even has HDMI out. It's a 4th or 5th generation chip, so it gets more channels, and it's not affected as much by multipath.
Check here to see if it's in stock in your area.
http://www.radioshack.com/product.asp?catalog%5Fname=CTLG&category%5Fname=CTLG%5F003%5F006%5F000%5F000&product%5Fid=16%2D3499#
Check here to see if it's in stock in your area.
http://www.radioshack.com/product.asp?catalog%5Fname=CTLG&category%5Fname=CTLG%5F003%5F006%5F000%5F000&product%5Fid=16%2D3499#