If you are in the US, Aquatic Foods of California are offering free samples of their Blackworms. Go to their site here and click the "Free Blackworms" box and print the certificate.
It tells you what to do if your lfs doesn't stock them. I don't know how big the sample is or how widespread they are available, but it's free and it can't hurt to ask.
It tells you what to do if your lfs doesn't stock them. I don't know how big the sample is or how widespread they are available, but it's free and it can't hurt to ask.