Ask HN: Complete POS For Consignment Shop?

I was asked to create a complete system that includes a point of sale, register, and a way for users to create bar codes for products as they are pulled off the truck. These items will be based on a split like it works in consignment shops.

Instead of creating such a system from scratch, though, it would likely be better to simply buy a pre-existing solution, but I have not found anything good. Do you have any recommendations for products that fit this description?