Bearing "brand" is one thing... bearing manufacturer is another. Avid, Boca*, ProTek, etc, are merely resellers with their own brand connotation. They are not manufacturers, however. The aforementioned all likely come from bulk Asian manufacturers and are just repackaged. This includes manufacturer bearings (Losi, Mugen, etc).
The RC industry is too small a scope to have custom bearing applications.
If you are interested in actual quality manufacturers, like SKF, FAG, etc, then that is another topic. Unfortunately as it's been documented before, it's not cost effective to install expensive bearings. Over the course of their lifespan you could install several new $1 bearings in their place.
*Referring to their $1 and $10 store