If you get the parts cut via the linked online place ( ponoko ) it costs $48 just to get the cut parts. This obviously doesn't include the rest of the parts. Buying all the needed parts for this would cost $130 ( am including the $48 here ) each if you build them yourself. You'd have to build at least 5 to get this price. Realistically making one of these would cost around $200.

It will never be sold commercially, since the designs are CC by-nc-sa.

Unless you are hardcore about building cute expensive tech toys, best move along.