If you find a local reptile store they should be willing to sell you a couple feeders instead other standard 25+ pack. Back when I had more amphibians I would grow my own earthworms, it was easy and safe. Never had an issue with the ones from the bait shop either.
As far as raising fish as feeders I had good luck with platies. They produced better than swordtails which in my experience would randomly die on occasion, I think swordtails have been inbred more severely. Swordtails are worth more though if you have a local fish store that you can sell them too if they overproduce.
As far as raising fish as feeders I had good luck with platies. They produced better than swordtails which in my experience would randomly die on occasion, I think swordtails have been inbred more severely. Swordtails are worth more though if you have a local fish store that you can sell them too if they overproduce.