In reverse order...

Rocker arms from LKQ. New ones are a billion dollars. And that was before the dollar went into the toilet. 89Yen to the dollar WTF!!!

Nismoshop (west covina Nissan) has excellent prices. Also check nissanparts.cc (tacoma Nissan) as they're pricing things agressively as well.

That bearing looks like regular cadmium plated steel. Can never be sure what composition, though.

Hey Longfellow, did you meet Ian when you were over this weekend? He's an Engineer for Timkin bearings. You should have asked him about it while you had the chance.