We love sainsburys the best, but also get bits from Tesco, our local Asian store, Holland and Barrett and amazon (e.g. coconut oil is much cheaper)
We also get the majority of our veg and fruit from a green grocer which saves a TONNE of money - 5 avocadoes for £1, 10 blood oranges for £1, 2 boxes of raspberries for £1.25 etc. But we also tend to go for organic where possible so that bumps up prices a bit.
Our budget is £50 a week so £200 a month, including everything for the house and cat food. We rarely spend that much though, it's more around £140-160 a month.
We eat out or get a take away 1-2 times a month but tend to spend very little, the average is £25 as we tend to share our food and rarely order drinks. I promise we are not boring really!!! We love food but prefer doing it ourselves esp. since we both are vegan now - tonight is butternut and cauliflower korma, then sweetpotato and bean burgers, black-eyed bean stew and jollof rice, brocolli and cannelini bean soup, sun-dried tomato and aubergine pasta, and kimchi and tofu stir fry.