H.P. printer cartridges (Lower Sunbury. TW16)

Long shot, but does anybody have any spare Hewlett Packard, type 304 (or equivalent) printer ink cartridges ? Part used ones are fine. I have a H.P. Deskjet 2600 printer and don't know if it works or not and need some sort of working cartridge in it to find out before buying new ones. Can collect. Many thanks. Richard (07879 863234).