Thumb Score: +19

Amazon [amazon.com] has 4-Count Marks-A-Lot Desk Style Dry Erase Marker for $4.29. Shipping is free w/ Prime or on $35+.

Product Description from Amazon:[list][*]Ink wipes away easily with an eraser or dry cloth, so you can use these dry erase markers freely on a traditional dry erase white board or turn a sheet protector into a reusable document[*]The cap can be left off for up to 24 hours without drying out due to the long-lasting ink formulation