11 unblack CDs for $40??? is this good deal?

https://visionofgodrecords.com/product/new-release-unblackblack-metal-metal-fundraiser-cd-bundle

Is this a good deal? I own none of them. Are CDs the only formats or are some of these streamable via Google Play Music or similar services?

It's a pretty good deal... if you like the music!  I own They Wither's EP and it's very good.  I was considering getting the Cerimonial Sacred albums too because I think they sound pretty good.  I never got into the other bands' music but most of those are generally well respected Christian black metal bands.  I've heard positive things about the new Demoniciduth as well.

Yes. It is a good deal.

It's less than $4 an album.  Even if only half of them are good, that's $8 a disc and you can sell the others.