With orders of $25 or more, Amazon offers the Quartet Magnetic Chore Chart 12x12" Dry Erase Board for $5.24 with free shipping. (Walmart has it for the same price, but you'll need to spend $35 to bag free shipping.) That's $9 off list and the best deal we could find. It also has a blank space at the bottom to leave notes or hang papers.
Note: The product you'll receive may not match the product picture as you'll receive a random design. Additionally, this item is offered as part of Amazon's "add-on program" and can only be purchased with orders of $25 or more.
Update: Shipping info has been corrected. Also, this item will now take up to two months to ship.