ACE Hardware (US Only)
http://www.acehardware.com

B&Q (UK Only)
http://www.diy.com

Do It Best (US Only) - online storefront for 4,100 independently owned home improvement stores
http://doitbest.com

Homebase (UK Only)
http://www.homebase.co.uk

Home Depot
http://www.homedepot.com

Lowes (US Only)
http://www.lowes.com

Pacific Columns
Pacific Columns is a leading supplier of interior/exterior architectural columns
http://www.pacificcolumns.com

Rona (Canada Only)
http://www.rona.ca

Sears (Canada Only) - large tool selection
http://www.sears.com