This Goodwill has 2 complete Model II systems that look to be going for cheap. Just too far to ship or drive for me though.
http://www.ebay.com/itm/Radio-Shack-TRS-80-Model-II-Micro-Computer-VINTAGE-2-Local-Pickup-Only/311385165906
http://www.ebay.com/itm/Radio-Shack-TRS-80-Model-II-Micro-Computer-VINTAGE-Local-Pickup-Only/400941125232
http://www.ebay.com/itm/Radio-Shack-TRS-80-Model-II-Micro-Computer-VINTAGE-2-Local-Pickup-Only/311385165906
http://www.ebay.com/itm/Radio-Shack-TRS-80-Model-II-Micro-Computer-VINTAGE-Local-Pickup-Only/400941125232