Wow!  If you are looking to enhance your costume this year, e.l.f Cosmetics has a deal for you!   Take 50% off all products in our Halloween category using code TREAT! Offer valid 10/11-10/15.  I took a look around and most of the items are just regular cosmetics so this is an amazing deal you cannot pass up!  Here are a few examples:

Eye Enhancing Eyeshadow
Eye Shadow $6 so only $3 with 50% off

eyeliner, eye liner, eye color, eye pencil, makeup pencil, shimmer
Shimmer Eyeliner Pencil $1 so only $.50 after the discount