I have a lovely two-tiered light system for starting seeds inside. Use it a lot. It has metal frame and trays sit on the frame, hanging by their short end lips. Seed pots sit inside these solid-bottom trays. The bottom trays are made of light green colored plastic.

Unfortunately, they are brittle and the end edges are snapping off. I haven't been able to locate a source for them. Anyone know what I'm talking about and know where I might find them?