Brassworks Embossing 
Brass embossing stencils, templates, and supplies.
http://www.brassworksembossing.com/Embossing Fun
Brass templates and embossing supplies for making greeting cards.
http://www.members.shaw.ca/uehutch/
Polly's Pals
Offers a selection of categorized brass stencils and accessories.
http://www.pollyspals.com/
Stencil with Style
Offers a variety of brass embossing stencils. Also video, books, and accessories.
http://stencilwithstyle.com/
Embossing Etc.
Brass templates and embossing supplies.
http://store.embossing-etc.com/
Aspen Lane Crafts
Brass stencils, embossing templates, and embossing supplies.
http://www.aspenlanecrafts.com
