I have recently purchased the envy 4520 and it seems like I am ALWAYS having to but ink for this thing! It seems like we don't print all that much. I have looked everywhere to find out how many pages I can get with both the black and color cartridges, but I can't find the answer. Does anyone know? I'd like to keep tabs on pages printed and ink levels to make sure I am getting what HP said I would. This is so aggravating.