Similar to @Nick's CSA suggestionCSA suggestion, I've got friends who formed a (sort of) food conglomerate.
It needs to be a decent size (4 - 8 families). Once a week, one family goes to the wholesale markets and buys the fruit & veg for all families.
Its one of those things where it is financially cheaper, but time and resource expensive. (8 families of fruit is a lot of apples and wont fit on your backseat)
Once you have your routine down, it is very effective!