Hatz Biplane Association

Some sources for tools - both aircraft and non-aircraft specific:

Aircraft Tool Supply
http://www.aircraft-tool.com/

Avery Tools
http://www.averytools.com/

Brown Aviation Tool Supply
http://www.browntool.com/

U.S. Tool & Supply
http://www.ustool.com

Wholesale Tool
http://www.wttool.com/

Northern Tool
http://www.northerntool.com/

Harbor Freight
http://www.harborfreight.com/