Local Trucks and shops near stations
Keep your eyes peeled. especially for seasonal items- the little trucks that park around back alleys and side streets usually offer good deals. Also near most train stations you can find fruit and veggie stands- later in the day they often run specials of things that they need to move that are getting very ripe! Also even for special expensive fruits there are different price levels. For example perfect big peaches will be in one display case at a premium but under that will be slightly less fancy versions for usually 1/2 the price. So look, and learn and you can find great deals.