It feels weird to me, too, but I guess we're now calling 90s things vintage. Ouch!
I was inspired by Paperbacks From Hell by Grady Hendrix and some awesome Instagram accounts to go on a hunt for some "vintage" books, from Horror, teen and children books.
Inspired by these accounts:
@booksuncovered [They judge books by their covers, but mostly post older, nostalgic type books.]
@vintagebooknerd [They post vintage books, obviously!]
Disclaimer: Times were different when these were published. If you look into getting any of these, I am sure by today's standards, they are full of problematic, offensive material (even the children books!) Also, it would be a safe bet to say all the horror books have trigger warnings! I am mentioning the original publish date, not the date of any reprints.
I did something wild... I bought all these without looking up ratings and reviews, like people used to do back in the day.
Okay on to the show!
Here is what I found!
An Old Friend of the Family [1979 - Dracula series #3 - Mentioned in Paperbacks From Hell]
The Children [1982 - Mentioned in Paperbacks From Hell]
Dominion [1982- Dracula series #5]
Demon Within 
Cutting Edge 
The Perfume 
Trapped: Cages of Mind and Body 
The Accident 
Don't Look Behind You 
The Twisted Window 
Stranger With My Face [1981 - Mentioned in Paperbacks From Hell]
The Dreamer 
Humor - Horror - and the Supernatural 
The Stepdaughter 
Midnight Fright 
My True Love Gave To Me [1993 - Scream series #5 (stand-alone series)]
The Scariest Stories You've Ever Heard Part 3 
The Immortal 
The Party [1988 - Final Friends #1]
The Dance [1988 - Final Friends #2]
Mary Anne's Book [1996 - The Babysitters Club Portrait Collection]
Logan Bruno, Boy Baby-sitter [1991 - The Babysitters Club Special Edition]
Claudia's Book [1995 - The Babysitters Club Portrait Collection]
Sideways Stories from Wayside School [1978 - Wayside #1]
Sunny, Diary Two [1998 - California Diaries #6]
Wayside School is Falling Down [1989 - Wayside #2]
The Stranger I Left Behind 
A Taste Of Smoke 
The Secret Secret Passage [1992 - Clue #2]
The Whipping Boy 
The Ghostmobile 
Fourth-Graders Don't Believe In Witches 
Secret Agents Four 
Mystery of the Secret Dolls