If you are looking for a complete PC Based POS system then check out the Keystroke system.
Keystroke POS is an affordable, robust Windows PC based POS system for independent retail stores. Once you start looking into this system you will see why it has been so popular for over two decades now. Keystroke is comprehensive from the front of the house to the back. Inventory items are at the core of this system. Inventory is tracked from the time you receive if from a purchase order to your vendor to the time it is sold to you customer. You will be able to report on stock levels, profit margin, allocation, on order, which of your vendors the item is available from and what cost and who you sold them. We don't use the term comprehensive lightly when describing this system!