Fair Oaks Sutlery Fair Oaks sells the Robert Land brogans, which are quite possibly the best on the market, and run $89 a pair, heel plates are $3.50, and laces $1.50. Fair Oaks also have frequent sales and specials on uniforms and gear.
The Jersey Skillet Licker These guys have the highest quality goods I've found, at unfortunately, some of the hightest costs.
C&D Jarnagin C&D Jarnagin have quality reproduction uniforms, relatively the same cost as the lower quality/authenticity as other vendors. Recomended for getting your Sack coat.
Fall Creek Sutlery Fall Creek sells an extensive line of some high quality uniforms and equipment. Fall Creak currently has some awesome deals on high-end goods, from uniforms to leather goods.
Regimental Quartermaster The Regimental Quartermaster also has frequent deals on firearms, accoutrements, and other wares.