Ok, that’s almost carbon copy of what I do as well. I also use the cardboard bottom box pieces that cans come on in the grocery store. Hubby snags those when he’s at Kroger. So far they haven’t minded. He also snags them from SAMs too.
I put those in el cheapo garbage bags and duct tape them in such a way that water can’t get into them easily. They’re not really reusable from season to season but the garbage bags are el cheapo and the cardboard boxes go on the compost pile or in a walkway in the garden covered with mulch.
I also save the large (disposable) aluminum cooking pans from family reunions, get togethers and that sort of stuff. Hubby snags them from work when he can. Also the plastic covered (with plastic bottom) deli containers are great for setting cups and stuff in for access to water. I also use those as starting trays, since they have fitted covers, for the really small seeds like stevia and oregano.
Waste not, want not.
Ok, back to transplanting the gazillion sweet peppers I’ve got started. Started enough for us, my inlaws, my parents, our tax lady, a couple neighbors and maybe my SIL too.
/johnny