Patricio,


The bearing sizes that you need are:

Front 10x26x8 mm
Rear 20x42x8 mm

Contact Paul at [link=http://rc-bearings.com]RC-Bearings[/link].
His bearings are the same, but his prices are 55%-70% lower, for both steel and ceramic bearings.

You will get nothing for paying someone else more... Unless you opt for WIB bearings.
You can probably get these bearings in any of the better hardware stores in Santiago.