"Grocery suppliers" refers to companies or individuals who provide food, beverages, and other household products to grocery stores or supermarkets for them to sell to customers. Full definition
For example, it requires that grocery supply agreements must be in writing and include certain matters. (australiancompetitionlaw.org)
I buy them from our local grocery supply — Cash and Carry. (iheartnaptime.net)
(1) The retailer's product ranging and shelf space allocation principles must be published or provided to all suppliers with whom the retailer has grocery supply agreements. (legislation.gov.au)