If, like me, you've been thrift-shopping ever since the 1980s there was a Hadassah thrift shop across the street from your junior high school, you might have figured this out already. It's really hard to stop. There is always a treasure around the corner.
I especially love small ones (hard to find), as well as old-looking versions, like the board above (75 cents). I use these what taking pictures for my website and to clip purse orders, to do lists, and more in handy locations.
PS - If you do end up buying something, I high recommend photographing it inside your car, as I did with the clipboard shot. (Fakey aged and Poloroid-ed with this Android application.) Somehow the natural light in a car seems to be the perfect little photo studio for a quick shot.