Look what I got at the Sally Ann tonight! It was originally a cook book stand that had a plexiglass front, so the cook book would be held open, and the plexiglass would keep the book clean from cooking splatters.
I unscrewed the hinge that held the cover, and tossed the piece that supported the book, and have a new ruler corral for $3.99. It's pretty solid, and has non-slip feet on the base. I even tested my 15" Square ruler, and it is supported just fine. I love a good thrifty find, that solves an organization problem. Keep your eyes peeled for something like this in the thrift shops!