Last time i went searching for these I ended up finding a wider selection at pep boys. I think they had them in little packs or 5 or so labeled out by make and year of the car. Can't remember the price but definitely cheaper than $5 a piece.
I was looking for nissan ones at the time and finally found them at pep boys, but you may have an easier time looking for jeep ones.
either way take the used one with you, you may be able to size match it to one used by another manufacturer if you can't find jeep specific.