Purchase the HP printer cartridges you need online if you follow these tips:
Make sure the site is one that deals with HP products: - Instead of the generic HP cartridges that some sites will try to sell you, find a site that will sell you the authentic product. Make sure you know your correct model number
Make sure the site is secure: - While most of the online vendors selling printer cartridges are secure sites that offer quality products, any time you make a purchase online, especially when you are using your credit card, you should be certain that the site is secure.
An HP printer is designed to last a good long time. Shop around for the best deals online when it comes to replacing your HP printer cartridges.