For a girls camp craft we made magnet boards. I saw this idea on Pin terest where they used stove top covers. Unfortunately, the Dollar Store by me didn't sell them anymore. So I found the next best thing, a 12" pizza tin ($1). It was PERFECT and a 12x12" scrapbook paper fit like a glove. As far as magnets go, I wanted to use the clear stones, but I found that they weren't strong enough to hold a piece of paper. So I just used wood square pieces I found at Michaels. Then clothespins from the Dollar Store. All in all, it was around $2.50 per girl, but depending if you have some supplies on hand, I bet you could make it less than that.