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The 105XL is the same cartridge, just sold for $4.99. The 105XL cartridge can be modified to work with the any printer that uses the 100 or 100XL. The 100, 100XL and 105XL are all the SAME physical cartridge, just with different size ink fills. The 105XL physically fits into the S605 with no modification. When installed, the printer says "unsupported ink cartridge." How does it know, seeing as it's just an ink well and not a print head? Under the label at the top is an RFID chip. All you have to do is swap the chip with an 100 or 100XL cartridge and the 105XL will work in your Lexmark printer. Happy printing!