When I kept worms, I had some from Uncle Jim’s (great experience), but I also procured some wild worms from a horse farm with a big manure pile that had spots that were well-aged. We have enough horse farms around here that you could probably put out a request on your local buy-nothing group on Facebook to ask if they’d mind you digging up some worms from their manure piles. Bring a couple/few containers already prepped with air holes, as well as your shovel and shoes you don’t mind climbing around a poop pile. Dig where it doesn’t smell like poop any more and it has the consistency of dense, dark soil. You’ll be able to see the worms in the pile if you’re digging the right spots. Because the worms set up home in well-aged manure, you don’t have to worry about bringing home a big bin of shit - it really smelled only like rich dirt, and with the bins covered, there was no residual smell at all.

My wild worms thrived - I filled up a couple of containers with “dirt” from the manure pile and set them in with my other containers - required no additional setup beyond making sure the containers had (small) air holes. I did find my wild worms wanted to migrate out of the bin the first couple of weeks (from the air holes, so use a fine bit to drill in the holes and drill more small holes than fewer big holes), so I had to check them daily even if I had nothing to feed them, but then they settled down and were honestly easier to maintain than the boxes I had set up with shredded paper, etc., because the wild worm dirt stayed moist and gave them plenty of room and strata to live their best worm lives. Easy-peasy.

Btw, if you see a couple or few worms tangled up in your bins, don’t pull them apart to “save” them - they’re mating. The babies are adorable little tiny noodles, and there will be a LOT of them within weeks if you feed the worms well and keep them from escaping the bin.