I’ve seen “fur arrow tracers” selling on some specialty sites for as much as $5 for enough material to wrap a dozen arrows. Instead, you can go to just about any fly shop (or some craft shops) and buy rabbit fur “zonker strips” in a sufficient quantity to wrap 6 dozen arrows or more, for about $2.50. Slap a little Barge cement on the backside of the rabbit strip, wrap it, and you’re set.

These are great for shooting in low light conditions and tracking your arrow flight. They are quite helpful for finding “misplaced” arrows as well, and I find that they don’t affect arrow flight at all.