I have seen this so many times, but still think it is a great idea in the right place. I suggest to find an antique or vintage mirror on Craigs List or some little hole in the wall shop...and turn into a chalkboard. The chalkboard paint sells for about $12 for a quart at Lowe's or Home Depot. The last picture is from Restoration Hardware where the smallest one starts at well over $300. I think you can make your own for pennies, compared to that!