From now through June 18, you can get a free 5-pack of Sharpie highlighters at OfficeMax. In order to see the offer, click on “Access Bonus Coupons” in the top right and then print the offer. However that ends up printing that whole darn page, which is beyond idiotic. You can instead print the image above and hope they take it.
You might want to call ahead to make sure they have some in stock before heading out.