Unfortunately, we do not sell or ship cassettes by the individual pouch. The cassettes only are sold and purchased by a box of 25. Also, I am not authorized to replace a box of 25 cassettes in place of one defective.
Good news, the cassette can still be used. The customer only needs to swipe the barcode from another cassette. But, it needs to be the same lot number to work. Also, the most simple way is to press the "Last Used Button" on the main screen. This will automatically use the last barcode scanned.