For this listing you are only buying one of these cartridges I have five of them initially available you will be able to see how many are available so if you want to buy all 5 and you're the first possible purchaser and all fiber available you're more than welcome to purchase them while I will combine shipping in the same package there will be no discount for shipping as the shipping weight goes up and therefore the cost also goes up so there will be no shipping discount for multiple purchases