Used VTPH-2A
Good luck. When my search was narrowed down to a few contenders I started looking at used. Never did see a Herron for sale. Saw one that had sold the day it was listed and before I started looking. Then kept looking a good 6 months after deciding it would be the Herron. (I buy components, not deals.) In 6 months I saw zero listed but two times people had them listed as WANTED.
Its actually one of the things I have noticed having done this a long time. If you think you've found the best highest value component and they're on the used market, keep looking. Its not nearly as good as you think. Or nobody would be selling, and there would be way more buyers than sellers so they would be snapped up fast. Everyone has an opinion. Only one counts: Mr Market's.
Keith Herron by the way, unless you live near one of his dealers, he gives a small discount. 10% I think. But they sell used for near that anyway. So when Keith told me I'm far enough from a dealer to qualify I said, "Sold!"