Of course there's UsaKilts, there are many sites out there with sporrans, go with what you like.

Some suggested sites are...

http://www.stillwaterkilts.com/
http://www.kilts-n-stuff.com/index.html
and easily the nices sporrans out there...
http://home.c2i.net/kilted_1/public_html/main.html
Happy hunting.