4InkJets.com is having their $1 Ink Cartridge Sale again, get in while it’s available. They have a large variety on sale, so just search through and see if they have some for your specific printer. Remember that they do charge for shipping ($4.95) and there is a limit of one $1 sale item per customer.
It’s worth checking out their sale to see if you can find the ink your printer uses. Amazon is selling a black ink cartridge for the HP 61 for $13.90 while 4InkJets.com has a compatible cartridge on sale for $1.