I haven't seen these a thrifts, but I DO occasionally run into prints of Sad-Eyed Children in the thrift stores. They usually disappear pretty quickly, I notice.
i sure wished i lived in an area where the Margaret Keane big eyed children prints showed up in the thrift stores!! susie sad eyes dolls are a riff on those pieces done by the prolific artist. well, that's the thrill of the hunt...pop pirate