This is a subject very close to my heart, we try to always buy veg in season ( will not buy anything out of season if i can help it) and also will avoid anything with large foodmiles.
Also, we are very lucky to have 3 acres of land of which half acre is an orchard, a cutting area, and a veg plot with a 40ft poly tunnel and a 20 ft glass greenhouse. Up until the suprise arrival of DS3 i was an avid gardener and grew most winter veg and all our summer veg and fruit.
Alas, for the last 2 summers this has all go to pot, its now an overgrown wilderness,so 2010 is the year to get back to the earth.
I`m still amazed by the amount of stuff in the supermarkets that has come from the otherside of the world when there is local produce that is in season and has to better nutritionally.
I get my meat from the local butcher who only buys from local farms, but since we live in a rural agricultural area is probably not too difficult.
Never used veg boxes, even when we lived in London, but do use farmers markets here.