Seedling Trays

What is a sustainable way to plant seedlings? We have been scoring

free used starter trays from a local feed store. They are plastic and

for whatever reason the store uses them once and deems them useless.

We have been saving tofu trays and other random junk for seedlings,

but ultimately we need to plant a lot of seeds (like thousands). Is

there a sustainable way to do this? I've seen the newspaper wrap

system which I kind of like. That is a lot of work for thousands of

plants, but perhaps worth it.

Done