Staples is running a great deal right now where you can get these Sharpie Fine Point Permanent Markers 12 pack in Assorted Colors for only $3 with free shipping! Search 463710 and your Sharpies will pop right up.
If you want to add anything else to your order, shipping is free on every order thought 1/28, so this would be the time to do it!
(Thanks Kansas City Mamas!)