Etophian or African grocery stores in Houston?

So I made an resolution to myself to broaden my homecooking horzions and try new dishes. I have been wanting to make the Etophian dish Doro Wat and Injera bread, but for the life of me I cannot find any ingredients or spices. Any suggestions on where to go? I already have Berbere spice that I got from Penzey's, but might need more.