Cost per page is the average price of each page that you print. The best way to determine the average cost per page is to take the price of the cartridge and divide it by the page yield. For example, a genuine HP62XL high yield black ink cartridge costs $36.99 and has a page yield of 600. After doing a little math, the cost is around 6 cents per page. On the flip side, you can purchase a genuine Brother LC107 high yield black cartridge for $29.99 with a page yield of 1,200. The cost for the Brother cartridge would be around 2.5 cents per page. As you can see, the cost per page can vary widely depending on what machine you have. Take the time to do research and some comparison shopping before jumping on a great printer sale because you will probably be making up for it in the cost of ink.