the one thing i have found interesting are the ink packs. I personally have an HP printer that uses 02 ink packs. the funny thing about these is the price disparity on the inks. single colors are 11 bucks with black being 20 bucks. or i can get the 5 cartridge (cyan, light cyan, magenta, light magenta, and yellow) for close to $50, but what i usually get is the 6 cartridge pack (same as 5 cartridge, but it adds a black and 150-sheets of 4x6 photo paper) for 35 bucks.
I have asked several stores why the 5 cartridge costs more than the 6 cartridge and I have yet to get an answer other than "yeah, that doesnt make sense either"