I just setup an order to ServoCity for some parts for W.A.L.T.E.R. 3.0. It turns out that it isn't going to be all that expensive to build him up. It will cost $190.00 for the parts to build one full drive tower (including one motor at $49.95), and four aluminum support pylons. This does not include any electronics - motor controller ($69.95), MCU ($34.95), 2 rechargeable battery packs, and sensors.