Yesterday, during his birthday party, my 87 year-old dad informed me that he wants to start raisin' worms. I'm like

!!!!!! He's already got an old chest-type freezer and it's loaded with compost and whatever else....all he needs is worms. Any you guys got any do's or dont's or places where I can buy 'em? He wants "night crawlers". I searched online, but, a worm is a worm to me.