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I always use this website for my promo codes. It's great!

http://www.retailmenot.com/view/maccosmetics.com

They should be all there. I'd pick some out and try them! Not all will work but most of them should. :D

Mac Cosmetics Promo Code

Mac Offer Code

Savings.com has some MAC Cosmetic promo codes:

http://www.savings.com/m-MAC-coupons.html

coupon code jinsoon gives free shipping

lash99 gives free ZoomLash Sample + Free Shipping with any purchase

Mac Makeup Promo Code

survey9