Here are the compatible ink refills we offer for the Lexmark X4550 inkjet printer:
Original Lexmark 23, 24 ink cartridges, 18C1571 - 2 pack
$58.45
Original Lexmark #23 Black ink cartridge, 18C1523
$28.45
Original Lexmark #23A Black ink cartridge, 18C1623
$37.25