Sorry, i should've been more specific. They purchase in bulk from CNI and therefore get e discount, they have CNI's lasers on hand and ready to ship (usually) as opposed to contacting CNI, getting a ridiculous price, and waiting for it to be made. Also i believe the safety goggles are the same as for 532nm.
@HMike; There's plenty of both types here, but new people do arrive and we do our best to help them no matter what they do with lasers, and who knows, they may grow bored and start building their own. All in good time my friend.