Bluetooth beacons can cost as little as $5 and as much as $50, so it may not be practical to attach a beacon to every product. This is where other technologies can be used together with beacons. Barcodes and their electronic cousin, the RFID tag, cost pennies and can be used to quickly associate products with pallets. Waving an RFID reader over a stack of cardboard boxes or cartons on a pallet, can associate the cartons with a pallet in seconds. If we know that a carton with a serial number 123456 is on pallet A, and pallet A has a beacon on it, we can be sure where the carton is no matter where the pallet is moved to. The RFID scan that associates a carton with a pallet can be performed automatically by readers fixed to the fork lift trucks that move the pallets around.