We buy HP printer because it gives us complete peace of mind that its a high quality printer manufactured by worlds renowned manufacturer or printers. HP printers come in different sizes and flavors. Some printers simply function as printers only. Some printers may perform other tasks as well, like copying and scanning. After you buy an HP printer with desired functions, you then look for HP inkjet cartridges and the best deals you can possibly get on these cartridges.
One cool thing about HP printer cartridges is that a lot of HP cartridges contain one color only, instead of many. So, if you dont do much color printing and there is a specific color that you use a lot, then it will work greatly for you as it will save you lots of money.
HP has hundreds of thousands of customers from around the globe and to satisfy their needs, HP produces hundreds of different printers with different specifications. So, before buying an HP printer cartridge, you need to know the correct model number that will be compatible with your HP Printer.
Lets take HP Q6000A Toner as an example. If your printer requires this particular toner, then you should use it always to ensure best print quality. Your printer manual will guide you regarding compatible HP printer cartridges that which ones will be suitable for your printer.
One printer supports several cartridges. Your particular HP printer may not only be compatible with HP Q6000A Toner, it may also be compatible with Q6001A, Q6002A, Q6003A and so on.
 
If you are using an old HP printer then finding a toner cartridge for it in the local store will not be easy. Thus, you should buy such cartridges from online stores.