The really cheap cartridges might leak. 100% of the reviews I've read report third party inks are inferior (color wise) to inks made by the printer mfg. Staples brand included. It really depends on what you're printing. Might make a big difference if you're printing photos but not a big deal if you're printing color charts.
Suggestions on saving money.
Are you printing a lot of b&w? An inexpensive monochrome laser printer might offer substantial savings for part of your printing needs.
Buy a more expensive inkjet printer. The really cheap printers, under $100, will cost you $$$ in ink. The more expensive business class printers will accept high capacity print cartridges. The per page cost for ink will be at lot less, with original cartridges. Examples include HP printers. Some of the brother ink jet printers will have a lower per page cost.
I'm not sure if a color laser printer will save in consumables.
Print a real lot. Search the web. Some places have kits for CIS (continuous ink supply). Its a way to run a tube from a bottle of ink directly to a specially modified cartridge.