From the little I know about Somali chili powder, it is a blend of spices, rather than pure chili powder. If so, like many such blends, there will be many variations. Does that seem likely? I know of Somali stores in London, where there is a small but significant Somali immigrant community. No idea about availability in the US, sorry.
Is Devil's Penis another name for Peter Peppers? A search for those may yield results.
Not very helpful I realise; good luck!