If one is using a printer as expensive as this it pays to buy genuine Epson cartridges. Anyway I have not been 100% satisfied with alternative cartridges used on other Epson printers. Buying the full set of nine cartridges means that it works out cheaper than buying the cartridges individually, though the difference is not large. It seems that Amazon always uses Amazon Market Place firms to deliver cartridges and no doubt some offer a speedier service than others. One thing to watch out for when looking for the cheapest price is that some firms offer only eight cartridges as a set, including matte black or photo black but not both.