HP Designjet printer complete list by model number, with suggestions on a reliable ink company for after-market ink, especially for HP Designjet 5000 and 5500, but also others.
HP DesignJet T650 Large Format up to A0 Plotter Printer - 36" , with Mobile Printing (5HB10A) - HP Store UK
HP DesignJet Studio Steel Printer 24" Printer – Wideimage Print Solutions
HP DesignJet Studio plotter series - HP DesignJet large-format printing | HP Official Site
HP Designjet 500 A1 C7769B - Refurbished - With 12 months On-Site Warranty
HP DesignJet Plotter Printer Overview | HP® Tech Takes