I've always been a fan of applying Teflon tape over the feet of my mice, to make the mouse glide more smoothly and prevent the feet from wearing out. Cutting the tape to size and applying it without wrinkling it was always a PITA though.
For a while a few years ago you could get pre-cut Teflon circles from Newegg, but they were a bit on the pricey side, and regardless, they no longer seem to stock them.
A couple of weeks ago I came across these
on Amazon and ordered them. They seem to be the exact same ones that Newegg used to carry, except in a bulk roll of 100, at a small fraction of the price per unit. One roll should be good for many years assuming the adhesive doesn't dry out (which may be optimistic, but hey they're cheap). Amazon seems to have them in several different sizes; you'll want to get the ones that are at least 1/4" larger than the longest dimension of the feet on the bottom of your mouse.
The one caveat I have (which was also true for the Newegg ones) is that they can be a little difficult to remove from the backing sheet. The trick to doing this is to use the corner of a razor blade or other thin, sharp implement (e.g. tip of an X-Acto or Swiss Army knife blade) to lift the edge of the circle off the backing to get it started. Clean the bottom of the mouse, the knife blade, and your fingertips with isopropyl ahead of time to avoid contaminating the adhesive, to ensure that they adhere well.
The years just pass like trains. I wave, but they don't slow down.
-- Steven Wilson