Not to hijack, but I've been buying them for years, particularly the Edgewood Blvd calls. I'm amazed at the prices being paid for stuff I barely glanced at even five years ago. I've always carried a Tom Gaskins call just because it was handy and would fit in a shirt pocket. Doubt I paid over $10-$15 for one. Now they are well over $100, if you can find one of the originals (Palmdale) in working condition.
Good luck with your search.