What kind of products are you looking for? Worm bins? or worm castings? Or the worms themselves?
Personally, I don't think I would pay any money for the worm teas or even castings being sold by others since I would rather have my own worms eat my garbage and produce castings for me.
I also have my worms outdoors so a nice big wood bin is appropriate for me so I didn't spend much money on materials for the worm bin. The can-O-worms might be appropriate for a worm bin you can keep right in your kitchen next to the trash can.
The link below is the company I got my first 2lb of worms from. They also sell the can-o-worms and plans for a larger wood bin though you can probably figure out how to build your own bin without spending money on plans.

Here is a link that might be useful: Our Vital Earth