Archive.org has some scans (maybe all of Uncle Creepy's and Vampi's books):
https://archive.org/details/warrenpublishing?&sort=-downloads&page=3
Cousin Eerie seems to have little representation. There are some other Warren publications also.
Yessss.
Thank you!
The Warren books were fun, but IMHO are not nearly as good as the EC comics they were patterned after.