Here are several so you can shop around. Being a avid student of the civil war and a civil war skirmisher, I actually use'em for what they were intended, isn't that silly?

http://www.legendaryarms.com/leatcappouc.html

http://www.brigadesutler.com/leather_goods.htm

http://colo1.midtnn.net/Catalog/catpg10.htm
(near the bottom of the page)

http://cwsutler.hypermart.net/LTH.html

These sites can also be a good source of belts, buckles and small cartridge boxes. The larger cartridge boxes might even be adapted to use as a sporran.

Mike