Pritop ink cartridges

Hello, 

I have for about 6-7 years now , an Hp 2050 inkjet ; it works well, and I don't  use it much, only for administrative forms ( tm30, letters  etc )

I shall need one day new cartridges, I know the system of cartridges on the side of the printer, but my computer shop tells me they can't do it because the printer is too old ( ? ) 

on Lazada, HP original cartridges are pretty expensive, but I have seen they sell " Printo cartridges", from China , which suit my printer and are cheaper 

is Printo good brand ? Other wise, I forget to ask my computer shop how much is the system aside the printer ; you know how much ? 

Maybe better to buy a new printer and ask for the system cartridges on the side ; I am satisfied of my printer , I use it a few times a year, I don't know what to do , maybe buy the original HP ink 

what is your suggestion ? thanks