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Take a look at the pdf file at http://www.lucs.lu.se/builder-robot. It has all the steps and at the very end a list of all the parts.
We are using https://www.elfa.se/en/nimh-battery-pack-12-1500-mah-gp-batteries-150aam10y1h/p/16932768
An estimation would be a total of 4500USD. The major costs are the 13 Dynamixel MX-28 servos (2800USD), Mac Mini (500USD) and the Battery packs (480USD).
Building The Builder RobotView Instructable »