http://inkmizer.com/cartridges.htm Epson B-300, B-310N, B-500DN, B-510DN refillable cartridge chip RR and set up. Learn how to save a lot of money in ink cost by switching to refillable cartridges. These cartridges can be refilled thousands of times. Epson charges $49.49 for 55 ml. for the color cartridges. If you purchase the ink from Inkmizer.com you will pay .19 cents per ml. From Epson it will cost you .90 cents per ml. That's 4.5 times more to print than what you need to pay. Our inks are manufactured in the USA. Epson inks are from China.