Welcome to the site

First off, is there any reason why you have decided on that model? Do you need it to be RTR, or are you prepared to build it from kit?.
You can pick up the Tamiya TT01 chassis kits for as little as £50 on Ebay, and even some shops. Ok, so you may not get the most up to date shell, but the chassis will be the same. The RTR kits don't come with ball raced either, so at a later date you will need to rip it apart to fit them. At least if you build the kit you can fit them as you go.
Bearings can be purchased here
http://www.rcbearings.co.uk/index.php?main_page=product_info&cPath=15_3_8&products_id=51I have a TT01 kit, they are great, and good if just getting into the hobby.