I have sold my red wigglers from my compost many times through craigslist, but only locally. I have previously sold them in quantities of about 50 worms for about $5.00 in a quart of compost to be used as starter. The folks came to me.
If you are interested in some of my composting worms, I could send some to you for only the cost of the shipping through USPS. I think the smallest priority box that could hold the worms easily is about $5.00. If you are willing to do this as an shipping experiment with me to see if they make it, if you pick up the shipping costs, you can have the worms for free. I will have to find a container small enough to fit the box other than my quarts. If you are interested, please let me know. I would want to ship on a Monday so they don't sit on a loading dock over a weekend.
Here is a pic with some of my compost with worms in it.
did you try a place that sells bait. most of them sell nightcrawlers but some of them also sell reg, redworms. You don't want nightcrawlers, just the red worms. If you can't find them, the post office sells boxes for pirorty mail for 8 bucks a box and its all you cram in the box for the same price. Glad plastic boxes should fit in them and you can probably get more than one. in the box marrie