I culture red wiggler worms (google it). They're like earthworms, except a bit smaller, don't require cooling and eat veggies (i.e. kitchen waste like corn cobs, wilted lettuce, junk mail, etc.)
Search Craigslist (or online) for composting worms or red wigglers and you can buy them by the pound. I got mine from these guys:
http://www.veterancompost.com/
I have a rubbermaid bin of them in my garage that's been going for a couple of years and supplies more than enough worms for my 50+ tank fishroom.
Can't imagine buying worms every week... or getting them from Wal-Mart!
Matt