I don't do ink jet. Bought a reasonable wireless laser printer for around $100...get the refills for THAT on amazon for around $14/toner cartridge. I print a lot of coupons so it works well. You might check for ink cartridges there.
If you do a lot of printing 123inkjets is pretty good for buying 3+ cartridges if you don't do a lot of printing try EBay,Wal Mart or Staples own brand is very good.
Try an Office Max around you - they will refill your cartridges. It saves about $5 off the purchase price. And if you do buy an XL cartridge they refill it for the same price as a regular cartridge.