The cost is 1,100.00 USD.
Link 'The DW-EK01 includes all the electronic parts used in the DARwIn-OP robot.'
20 MX-28T = 3,738.30
DARwIn-OP clone = 4,838.30 USD "Fascinating,"
Cost of a DARwIn-OP = 12,000.00 USD.
If you make your own brackets and outer skins you can get a OP for less then half the cost of a ready to walk version!