Avoid excess costs, spillage and waste by using high quality, reliable HP ink cartridges that work every time to provide you with the best quality and value from your printer.
Interactive system technology in HP 18 Officejet Ink Cartridges and HP Printer make automatic and continuous adjustments to optimise print quality.
Lower overall cost of printing with individually replaceable ink cartridges and reliable operation.
HP Smart printing technology offers easy supplies replacement and HP Sure Supply1 offers convenient on-line ordering.
Manufacturer's Reference: C4936A
Colour: Black
$34.00 at OW
$33.00 at Big W
So indeed it is a good bargain with free shipping although my printer doesn't use this cartridge number but certainly a good deal