I mean the hybrid SACDs are OOP, but a bunch of them are still in stock at amazon for less than $10 each. I don't know if it's a good thing or a bad thing, I completed my set a while ago. If there is a particular performance you want get it now before they are gone for good. I have never heard the redbook only CDs, though a lot of people on another classical board think the new redbook hybrid SACD mastering is better. The hybrid SACDs did use the original first generation tapes, I don't know which tapes the redbook only CDs used.