Try major supermarkets like Nakumatt - I know I have bought from there before - also those upmarket oldish shopping centres (Spring valley, peponi road, gigiri, etc ). Its not necessarily a mzungu/mhindi food. Quite good...all the best. To gauge interest, perhaps put an ad on facebook - offer to deliver, etc etc. But there is a market....unlike rabbit meat whose market has been widely rumoured for years