On Amazon right now you can get these fun Joyous Professional Hair Chalk Pens Hair Chalk Salon Temporary Hair Color Dye Touch-up (3 Packs-Blue+Purple+Pink#33) for only $7.99. These would make a great stocking stuffer.
This set will ship free with Amazon Prime or qualifies for free Super Saver Shipping with a $35 purchase.
Note: Amazon prices and promotions can change at any time. The price(s) listed in this post is/are subject to change.