Barcode Scanner

I have a friend that likes to dream about having his own barcode scanner and wandering through the stores he shops at changing all the prices on the things he is buying and all of the money he could save. It's silly, I know, but he likes it so I do not point out all the fallacies like he'd have to also have that store's software program or that someone would see what he is doing and call the cops.
Barcode scanners have become rather commonplace these days, seems like every store you go into has one, from giants like Walmart to the corner Mom and Pop shop that you stop into just for a soda. They not only make shopping quicker for the customers, they also are a valuable tool for the business, making it easier to change prices (remember price stickers?) but also for inventory control.
If you have any sort of business, a barcode scanner can help you keep track of what you have on hand, as well as the price. No more looking things up in a book or a wad of paper!
Scanners come in a variety of shapes and sizes, all in order to assist a business owner or shopkeeper who needs specific things. Why buy something that is too large for your business needs? That's a bad business practice.
It's your money, I know, but why waste it? The idea is to save money.
So, check out all the scanners that are available. Find the one that is right for you and your business needs and you are on your way to better business.
Oh, and keep an eye on your customers, just in case my friend shows up with a barcode scanner of his own.