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.