What has been the most overpriced vegetable/fruit you've bought (or refused to buy).
A few years ago (must be 5 years) when we had a very dry summer, and before I had my allotment, I paid £1.20 for an iceberg lettuce, and it wasn't the best one I'd seen either.
I needed some fresh green beans and new potatoes for a recipe and today I paid £1.39 for a 200g pack of green beans, in the summer I pick about twice as much in one day and all for the cost of a few seeds. The potatoes cost £1.13 for 12 baby sized ones.
In the early nineties, there was a large Japanese supermarket (Yaohan) in Colindale in London. Nearly all of their veg was air-freighted from Japan, so you could buy individually wrapped apples or tomatoes for 6 or 7 quid.
The parent company in Japan went bust and the supermarket that is there now seems to have a more sensible buying policy