Here's all the mechanical bits you'll need to build your very own RC hamster ball, including a few spare parts and a hex wrench for the hex head bolts.
Find a full BOM and build instructions here:
http://www.built-to-spec.com/blog/?p=668
And get all the design files here:
http://www.thingiverse.com/thing:13679
Videos here:
http://youtu.be/6X15eBpUSGU
http://youtu.be/nPqL2h55Tgc
http://youtu.be/-h-q-IdnQ3M
Shipping is included in the price of this item. Note that you'll still need all the laser cut parts, electronics, and a hamster ball to build this project!