Amazon resell strategy

Hello all, I am looking to selling products with high enough profit margin on Amazon, this are products in retail stores near me. I am planning on buying from this stores but won’t receive an invoice which Amazon requires to list the products on their website.

The minimum quantity order from a wholesaler is 50 units which I am not sure when or if I will be able to sale that .

Please let me know if you have any suggestions or strategies? I would like to directly resell the store products