Thanks bsfman. Guess I'll have to shell out the $30 duckets or so for a starter colony.

I plan to set these up in my ap room, but I don't necessarily want the flies all over, so I am wondering if it would be worth it to provide a separate enclosure or let them fly around the room. I also plan to setup a red worm composting bin in the same room, and figure that if I keep flies from accessing the worm bin, then nothing else would be a concern.