They are going to be hard to get good used. I got mine from Tri-City Plating in the U.S. and had them shipped to the border. They had much better prices than anything I could find in Canada and the quality is good.
the re pops are nice at around $300 US but after exchange and shipping they are about $500 Canadian.I'm very lucky my originals along with taillight bezels,door handles and all trim are still in good condition.
..I try to use original pieces when possible but that doesn't cut it for guys with show cars.