I have reused them when I didn't have any replacements. They work fine the
second time around.
But I don't do it normally. I use about a dozen traps a year, so, the $10
or whatever...

I bought a mechanical trap that flings them into a bin. I checked on one
after the winter was over. Can't even say roughly how many it caught, but
the bin was pretty full.
But it kept catching them. so the mouse smell can't be a problem.