Depends on what your definition
of "affordable" is:
The Art Lebedev Studio's website states that the Optimus keyboard should cost less than a "good mobile phone". With phones costing $600 or more these days, this doesn't give us much of an indication. but Rebello says the cost for materials for just the LEDs won't be high. "Assuming they buy it in large volume, the BoM (bill of materials) shouldn't be more than one dollar per key," says Robello. From this perspective, the keyboard could cost less than $300.