Blimbi – where to find?

I fell in love with this fruit I saw in a market out of city.

Now I am trying to find it in Chiang Mai.
Supermarkets doesn’t have (includes 2 Rimping brancges).
Fruit stalls as well.
Been in waroros, Mueang Mai and Jingjai and nothing.

Mission impossible?

Btw – couldn’t find fennel as well (veg, not seeds).

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