POS in alcohol (or point of sale for liquor stores) is the electronic system that processes and stores alcoholic drinks-related sales. You can consider it as a modern cash register that keeps an accurate track of all the things that you purchase from the store.

There is no single price for point of sale for liquor stores. Remember that the price depends on the retailer.

An in-store POS refers to the checkout area where a person pays for his/her drinks.

If you want a very good example of a point of sale system, then you can take a look at Square.