I haven't ordered from Magic Worms, but I did ask them a question and got a decent answer. They have been around for several years.
An inexpensive worm farm can be constructed using coconut fiber bedding, a big plastic tub, and some kind of tray to catch liquid (or a larger tub around the first). I have been using these kinds of tubs for European nightcrawlers and they works fine. The best food I've found for them are melon rinds (the best!), banana peels, and other fruit/vegetable waste.