Summer is a great time to get out and hit the weekend garage and tag sales, or peruse the antique and second hand shops in your area. Personally, I sometimes find it easier to check out etsy's vintage shops! Have a look...
86 home Vintage Knox Hat Box
Vintage prints and bookplates (clockwise from top left)
Edwardian brooch from WickedDarling (oh look, it's on sale!)