Most Pet stores will carry them every now-and-then. Check around some of the links on this site and see if you can find a supplier. If you go with some from a pet shop, make sure that they are going to be small enough! I had a place tell me that they were TINY and when I got them they were almost to the moth stage.
Culturing them would be very hard since you have to rely on them turning into moths first.
They grow very very very quickly, so to keep them an appropriate size for PDF"s you will have to refrigerate them between uses.
They are in a very sticky media when you get them so it is somewhat of an art to pick through it and get out the worms. I don't think there is really an exact way to do it without getting messy.
Culturing them would be very hard since you have to rely on them turning into moths first.
They grow very very very quickly, so to keep them an appropriate size for PDF"s you will have to refrigerate them between uses.
They are in a very sticky media when you get them so it is somewhat of an art to pick through it and get out the worms. I don't think there is really an exact way to do it without getting messy.