Drum Skull Drums always has a decent selection of imported goat etc -
http://www.drumskulldrums.com I also got a very sweet calf skin from them for the enu end of my bata. Worked out pretty well with a goat on the cha cha.
I should add: get the shaved skin if you aren't experienced with shaving goat skins on djembe's. It is kinda tricky razor work that needs to be done while the hair is wet and there is some risk of cutting the soft hide. Those african goats got some tough fur on em
The last order I got also had dung and god knows what else caked into the hair - a great way to contract who knows what.