Daily Sale offers this Peel and Stick Self-Adhesive Chalkboard or Whiteboard
with free shipping
. That's tied with our mention from two weeks ago, and outside of the mention below, that's the lowest total price we could find by $4. It measures 79" x 18", sticks to most walls, and includes chalk or a dry erase marker, depending on your selection. (Note: The countdown timer on the product page does not reflect an actual expiration time and resets daily.)
A close price: Corydor via Amazon offers the similar Con-tact Self-Adhesive Chalkboard Liner
for $7.95 with free shipping for Prime members, but no chalk is included.