I have the following:
Xerox 8500/8550 Black ink (3 sticks)
Xerox 8500/8550 Magenta ink (3 sticks)
Xerox 8500/8550 Cyan ink (3 sticks)
These are brand new and unopened
and Xerox 8500/8550 Yellow ink -which has been opened and one of the ink sticks has also been opened. (one of us opened it thinking it was for the 8560)
New the black is about £40 and the colours each are about £60.
I am looking for £100 for the lot if any one is interested.