Please post back if you find them. I've never seen them outside of preserved in oil and imported from Sicily. You can buy those at Rainbow Grocery in the condiments aisle.
At one point, I was so desperate for them that I mail-ordered seeds and tried to grow starts to give to friends who live in hot areas to grow, but I couldn't get them to sprout--the seeds must have been old.
Sometimes I see larger round peppers, 1-2" in diameter, at the Ferry Plaza or at Rainbow Grocery. They make great pickles for sandwiches, but they don't have the same spicy fruity flavor as the small 1/2" cherry peppers.
1745 Folsom St, San Francisco, CA 94103