Although I usually advise my customers not to buy refilled cartridges, sometimes there's no choice...in that case,
​LD is my favorite brand of remanufactured or refilled because i always get a cartridge that works!   --->>>
 (these will work in you hp designjet 430 or 450c)
click on photo below

fix your cartridges 

#40 Black hp ink cartridges here
                                  -------->>>>>>>>>>

 color HP ink ​from amazon
<<<-----Click on Photo
(colors that WILL FIll YOUR 450C OR 430 hp designjet color cartridges)

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HP # 10 and 82 refillable Ink Cartridge set Compatible for HP Designjet 500 500ps 800 800ps