I’ve gotten questions about where I find my images. I do use some images from “collage sheets”, there are lots of wonderful places on line to buy sheets of old photos, etc. one of my favorites is Art Chix Studio: http://artchixstudio.com/
I also have a small collection of photographs of woman from the Victorian era that I purchased from a man in Britain on E-Bay. They were pricey to ship but well worth it to have some beautiful and unique images that no one else has.
I also LOVE old books and use alot of images and text from those as well. Art books, dictionaries, text books, foreign language and children’s books are my favorite ones to buy. When buying old books don’t pay too much, I usually won’t pay more than a few dollars for a book. Don’t worry about intact spines, you’ll probably be tearing out pages anyway. And be leery of buying from garage sales, rumage sales or any places books might have been stored for a long time, the reason is bugs. Silver fish love old books and you can bring them home in old books (I’ve had it happen!) and they will spread to other books, etc (yuck!) so try to buy from book shops where the books have been kept in an environment free from creepy crawlers:)