WTB: 12-27 cassette in good shape

Looking for a lightly used 12-27 casette for a Shimano wheel. A friend is doing IMLP, and wants to make their bike a little more hill friendly.

9 or 10 speed?

I believe it’s 9 speed that is needed.

I have a ridden once ultegra 9 speed 12-27. It was mistakenly put on for one ride (I ride 10 speed)- $40 plus $5 shipping.

PM me