I've been crazyyyy about the local foods movement lately. I was hanging out alot with a mate who is such an adamant advocate of the practice. I've been berry picking galore! The best advice I can give to you is to bring someone along who doesn't like the berries that you are foraging for. You exponentially increase your product and there is no fear of lose ;-)
Avocados, local blueberries, local garlic, local collards, local cucumber, local onions, and some carrots from afar!