If you do need to buy onen be careful of the neoprene chainstay protectors. They don't seem to do that good a job. I had one for a couple of years on an old Cannondale and when I took it off, saw that the chain had still chewed through all the paintwork underneath.
A much better design involves coiled plastic that wraps around the chainstay.
My buddy sells frame protecting stickers...either clear or custom. We use them not only on the chainstays but any parts of the frame where there is cable rub. He's got alot of other cool bike-related sh*t too...
As other OPs have already suggested, nothing works as well and looks as good with tightly wrapped inner tube on the chainstay. I don't use zip ties, however. I had too many incidents where zip tie broke off from flying rock or chain slap. I use black duck tape or electrical tape.
I don't know if it is spelled right, but I use Mack Tack on the chainstay, and all the other places where there is cables rubbing on the frame (fork and head tube area)... Hope this helps! Works for me!
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