Questions about obscure Death metal demos...

[BloodOfChrist]

Hey everyone.

I was just wondering about these 2 demos.

NIHILISTIC MASS - Demo 1990 (cassette)
Ive never heard of this band or this demo or heard of it mentioned online. its not on M-A. I saw it in person and the only good record store around me. The day I went last week I picked up a Blessed Sickness tape for $3, they have tons of good DM demo stuff. I decided to check Nihilistic Mass out before buying it. Its a DM demo with very "cult" looking hand-drawn cover art. I dont remember song titles, I just remember the tape said "Demo '90". Does anyone know about this band or this demo, and does anyone know if its worth buying?

RIPPING FLESH (Mexico) - "Mercy" One-song Promotional Tape
I know this band had a single called "Mercy" in 1992 but Ive looked all over and not found anything on this tape. It has art that wasnt used on any other Ripping Flesh release, and the b-side has an Agony Lords rehearsal demo. The tracklist to the Agony Lords rehearsal is hand-written inside of the j-card. Does anyone know anything about the pressing/release of this tape (such as how many were pressed, and how much it should sell for)?

Thanks!

[omen of hate]

I've never heard of these two bands.

[Cochino]

I haven't heard of them neither.