I’m with your MIL,
i try to buy pasture raised organic eggs as much as possible , but recently I hardly find any,
they taste so much better than Normal supermarket ones.
bread , I buy sourdough bread from a well known bakery, can never have supermarket ones , they all seem to be thawed then re heated, never fresh no idea why!
tea , probably the one single thing I’m most snobbish about, it’s always from speciality tea places, like Mariage Freres.
baking chocolate , it has to be the good stuff from Valrohna , they make a huge difference.
spices and good olive oil, they more expensive the better,
but I’m not bothered by dairy stuff like cheese and yogurt , the artisan or organic stuff irritate my stomach so badly, and taste so strong ,
so I just get them M&S !