Welcome to the Okidata ES-3640E product page. Here you can find information and pricing for your Okidata 42918921 Genuine Okidata Toner Cartridge. Easy online ordering of your 42918923 Genuine Okidata Toner Cartridge, 57102401, 42918924, 42918924VP, 42918923, can be completed from this page. Tonerprice.com backs all of our cartridges with our exclusive warranty. As always, we provide free ground shipping on orders over $75 within the contiguous United States from 5 warehouses nationwide.