Clowns to the left of me, jokers to the right...
If you insist on staying (or god forbid) living in a 'high turdist' area, expect the (frankly obvious) consequences to price, quality and attitude that your God given right feels it deserves.
As one of a mere handful (singular) of farang in our chosen spot, the idea of getting ripped off is risible, and pointless.
If you insist on hanging about in the 'authentic' (bwahaha) spots, expect silly prices and <deleted>e quality.
I have no response to your reference to online markets, idiots do as idiots will...