I have raised them for quite a while in large rubbermaid storage containers. Punch some holes in the bottom for drainage, holes in the lid for air, throw in 3 or 4 inches of compost, and you have yourself a worm farm. Chicken mash makes a good worm feed. It don't smell, or attract fruitflies, which can wreck your worms. Fattens them up nicely as well. If you keep your beds shallow, you can harvest them easily. Or you can just buy a container of them at a store that sells bait, and keep them in the fridge. They shut down in a cold enviroment, you can keep them for months this way.