Product review (5 stars): Getting the real thing!
The stopper on our 5-year-old sink was fraying at the rubber edge gasket -- something my wife found most annoying, as the water level dropped fairly quickly.

i had stopped into Home Depot for a replacement part, which was cheap.  Inasmuch as it was inexpensive, but also because it was poorly made and didn't do the job.

Having learned my lesson, I went to Amazon.  The real stopper was easy to find there (much easier than on the InSinkERator website!) and easy to order.  It came quickly and works every bit as well as the original.

Yay for Amazon and InSinkErator!