Some recent passive solar heat auctions on eBay:

Passive Solar Energy~Homeowner's Guide~Heating/Cooling
US $18.95
End Date: Sunday May-20-2012 14:58:59 PDT
Buy It Now for only: US $18.95
Buy it now | Add to watch list

The Solar Heating Design Process: Active and Passive Systems by Jan F 0070354782
US $4.97
End Date: Monday May-21-2012 3:24:32 PDT
Buy It Now for only: US $4.97
Buy it now | Add to watch list
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