You can also try antique stores,flea markets,yard sales,or junk shops.I have a pair of period reading glasses that I only paid $25 for,including the frame case.They are great reading glasses that work great for whenever I do civilian impressions.
South Union Guard
"Always carry a flagon of whiskey in case of snakebite, and furthermore always carry a small snake"~W.C. Fields
"When I drink whiskey, I drink whiskey; and when I drink water, I drink water."~Michaleen Flynn 'The Quiet Man'