I got quoted $8.5 per bearing for 50 bearings + $30 shipping from China last time i looked into full ceramics. I’d do it, except a) i don’t really want to risk buying 50 bearings that don’t play well without a sample, and b) the idea of trying to get a ceramic bearing off of a tight bearing post, or on one, sounds like an awful time.
$70-$80 is laughable, such a rip off, you can buy individual concave fully ceramic bearings for $15-$20/piece easily.