In Mexico with a Telcel pre-paid plan the max I can get is 5GB/month for 500 pesos (around $25 USD).

In India last year it was difficult as a foreigner to get Jio, so went with a couple of other providers (Airtel and Vodophone) -- not expensive at all, but coverage was dicey up in Rishikesh where I was staying.

France was the best wrt to price/data ratio, something like 20 Euros per month with Orange got me 40GB, that was really nice to have away from any big cities (Capbreton).