You will likely notice that there is a significant difference in price between some of the cartridges available for this laser printer. “OEM” as seen in the item titles below stands for Original Equipment Manufacturer and refers to the brand new, name brand original cartridges manufactured directly by HP which come at a higher cost than compatible cartridges. Our “HP compatible” cartridges are also brand new however they are manufactured to our specs and will save you money while offering fantastic quality. They also come with a 1 year warranty! You may also note price differences in cases where items are offered in a multi-pack.