if they don't have it they will order it for you.
The co-op has a variety of bulk product bins. Goods are sold by the pound from these bins at a variety of costs. I have seen some large bulk products (olive oil, rice, etc.) but am not sure about lentils. Call the store for more details.
Ues theu csn sell larger quantities. You'll have to call and ask for the price. They usually give like 10% discount.
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