I'm 82 and purchased two "books" of the Old-Time ROSES stickers a long time ago. They are just about gone. Only select greeting cards to select individuals receive one of these stickers on the card or envelope. This why they have lasted so long.. I love old fashioned "things" even though I certainly enjoy today's conveniences, like central heat and air conditioning, etc.
I also have and use in the same manner as above, Old-Time Halloween stickers and Victorian Easter stickers, both by Dover.
Have you ever considered matching greeting cards? Hallmark used to do a nice job of matching stickers to cards. I loved their Mitford card series, no longer available. They're more into "stuff" like Joann Fabrics. Thing must change I guess. Thanks for the stickers! Kathryn