Pomboo. Si samaki, si mnyama. Si mzee, si kijana.
I tried a “shop” variant, dealing out a certain number of cards. But lost the game badly and just picked what I wanted for the next game. I don’t think I’ll return to the shop variant unless I find I’m always picking the same cards. It can definitely make he game more challenging though to limit your choices.
One thing that might work as a house rule (it does in other games) is to slightly shift prices when you play a lot: If an item is taken twice in a row, it gets a bit more expensive the next time, if an (available) item is not taken twice, it gets a bit cheaper. Works well with the "shop" option, but requires book-keeping...