If you don't mind lightly used, I found someone in the local camera club (Cleveland, OH) had accumulated equipment to be sold to raise money for the club. His sources were the estates of former members and those living who had switched from film to digital. Since the club had gone mostly digital, film stuff was CHEAP and taking up needed space. Over time I have gotten some plastic and then replaced with stainless trays for 16x20 and 20x24. Another source has been our own APUG classified section.
John Powers