I have only been here a bit over a month so far, but as long as i exclude the luxuries i buy from the imported cheese aisle, i've been very impressed with the prices of groceries here. (Moved from Oregon). Just shopping at the local Wellcome market i've bought chicken for a really good price, rolls from the bakery, though i'm not so sure on the bread since the loaves are different here. Juice is reasonable, though i wish they had powdered drinks.
I'm cheap though. I tailor most of my eating to conform to the best deals, with the occasional splurge for cheeses, because cheese is beautiful.