I’ve been transitioning from peat moss seed starter to coconut coir. It’s a more sustainable option and I really like the results I’m getting with it. In particular I find that it is really easy to prick out tiny multi sown seedlings without damaging delicate root systems. These come in compressed blocks and when water is added they expand and fill about 2 1/2 seed trays each with seed starting medium. I’ve even recycled and reused some from last year with absolutely no issues. I’m going to have to start looking into larger bulk options though, these blocks are great, but I always feel bad when I clear the last few off the shelf, and they just don’t seem to ever carry a large quantity of them at my local store.