Have an existing customer call and ask about getting ink for their HP plotter. They got the plotter from someone else. They called HP about getting ink and HP wouldn't sell it to them citing it was a special type that they could try to get from a Konica Minolta dealer. I hadn't heard of that but typed in the part number on order page and there it was. Anyone else know this? Plotter was HP DesingJet T2600.