I have a basically new Shimano Ultegra 10 speed, 12-27 cassette. It came with the groupset I ordered and I rode it for about 100 miles before I got around to changing it out for a 12-25. There aren't any hills around here so I don't need a 12-27.
It's pretty much brand new, $50 shipped in the CONUS.
Portside Athletics Blog
It's pretty much brand new, $50 shipped in the CONUS.
Portside Athletics Blog