Attmu Group via Amazon offers the Attmu Magnetic Whiteboard Dry Erasers 12-Pack
, model no. BBB-069, for $12.99. Coupon code "QE6Q9MWJ" cuts it to $9.87
. Plus, Prime members qualify for free shipping
. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $6.44.) That's $17 off and the lowest price we could find. The pack includes six yellow and six blue whiteboard erasers.