Get (2) Home Depot buckets with (1) lid Take one bucket and drill a shit load of 1/4" holes in the bottom (this bucket you'll use to migrate the little wigglers), for the lid youll need to drill some holes for ventilation, then put the lid on top of a piece of door screen and cut around the lid, rubber cement the screen to the inside of the lid, the screen will keep the little fuckers inside the bucket
You can use this logic on any plastic container and you worm bin will cost you about $5 to make opposed to the $150 bullshit worm condos