Can't remember where I heard of this book campaign that was run on IndieGoGo. Anyway, it's a fantastic book by artist Gary Baseman. He spent years collecting old family photos from antique stores and garage sales. Then people would send him some as well. The book is a compilation of old Halloween costume photos and they're even creepier since they are in black and white.
Not sure if the book will be sold elsewhere but it's worth picking up.