Just a heads-up on this unit spotted on eBay - a double peltier unit with hot and cold side heat sinks and fans (i.e. air-to-air format). It draws 10 Amps though so it would be a sizeable whack out of your power supply but by crikey it would cool the cajones off your DSLR.
http://www.ebay.com.au/itm/1PC-Therm...item1e987ddbb0
Peter