You should sell at wholesale prices. As the store will be selling a large volume of your goods and eliminates the selling aspect from your responsibility, they are entitled to a profit on the sale as well. Typically, a wholesale price would be 50% of the retail price, however the higher the volume, the lower the percentage as a general guideline. To begin the negotiations you will want to determine the quantity of goods they would like to purchase and the retail price they would be asking. Just keep in mind your production costs and ensure you are receiving a fair profit. Good luck!