4x4 piece of 1/4 inch chicken wire staked down or make a frame for it and set it out on your lawn or wherever you go for them let it sit for a bit and then go pick it up. You'll have nightcrawlers without straining your spine.
We usually buy ares but when I do pick them I wear rain pants and crawl ,back can't take bending over slot any more
I was thinking a small cordless shop vacuum might do the trick!
I rember the first time I got a good haul as a kid. Left them in bedding on the porch and the afternoon sun nuked them. Can never forget the smell of some melty crawlers.