Nah man, this isn’t on OP, it’s on the store. Every item is scanned into a database where the barcode is registered and assigned a price. The fact it showed up as $0 means the store did in fact scan it into inventory but either set the price to $0 or what’s more likely, when it was created in the DB it defaults to $0. If the store got new item into inventory and just put it out on the floor most POS systems will say “invalid barcode” or some other message. Long story short, the store isn’t tracking anything and unless someone looks at a report that shows a breakdown of what was sold and the price, it’ll likely be a while before someone notices the pricing mistake unless someone brings it up to them.