These people have their own organic farm in Pudong. They sell boxes of produce, all of it is 100% organic. Sign up for delivery subscriptions and they'll send you a box of fresh veg every week. If you sign up for three months it works out at about 120rmb per week for a 3kg box. Cheaper if you sign up for longer. They also offer one-off boxes so you can test out the goods first. Or, you can just go schedule a visit to the farm and pick the veggies yourself.