That's fair! To be honest it's good to support local businesses! So I took a quick look and there are three places in Mosman that I can find. Persica on Ave Rd, and then Mosman Fruit and Best Fruits which are both on military Rd.

Only other I can think of off the top of my head is the fruit and veg shop called Greenwood Grocer next to North Sydney station! Other than that I don't think I've seen anything off the top of my head but I'll let you know if I do!