I am eliminating plastic seed trays by using soil blockers. They are a bit pricey to purchase, but I believe that they will pay for themselves in a short time as I won't be buying plastic seed trays, and the soil blockers will last forever. I did purchase peat last year to make the soil block mix, but starting next year I'll have my own leaf mould,
compost and soil to use, so there won't be any purchased inputs except perhaps some rock dust.
I started all my plants in soil blocks last year, and once you get the rhythm of it, it doesn't take long to do up a few hundred blocks. Once the plants have filled the blocks with roots, they are very easy to handle, and I believe that I'll be able to sell plant starts in these soil blocks, without using cell packs. I'll be sure to do up a thread about how well that works out this year.
But I really found the soil blocks to be a wonderful thing. So easy to make, so much faster to plant, much healthier root systems, and we made the flats that they sit on out of scrap wood.
Just a thought.