Many things are cheaper in the sticks, that is a small Isaan village in my book.
Places like Tops are only to be found in some larger cities.
The main supermarkets are Lotus's, BigC and of course the 7s etc. I would imagine prices are fairly standard across the country.
Yesterday I paid 65 baht for a large bottle of Leo, Chang is 60.
In Pattaya recently I paid 55 baht in LK Metro for a small Leo, happy hour price before 9pm.
A full bowl of pork noodle soup 40 baht.
You can build a small 1 floor house with 2 bedrooms, living room, kitchen and bathroom for 1M baht maybe slightly more or less.
You do need a car but parking is free.