The site is acting up for me to see if this applies to sale stuff. I don't notice anything in the fine print saying it can't be used though.
FEATURED OFFERS
15% OFF FOR NATIONAL BEST FRIEND'S DAY!
[FONT=tstar_mono_roundregular][FONT=tstar_mono_roundbol]USE CODE: MAC15 AT CHECKOUT & RECEIVE 15% OFF ALL ORDERS.* EXCLUSIVELY ONLINE.[/FONT]
*Offer valid through 11:59 PM FRIDAY, JUNE 10, 2016 on orders shipping to U.S. & Canadian addresses only. Enter offer code MAC15 at checkout to receive 15% off your order at maccosmetics.com & maccosmetics.ca. Cannot be redeemed at MAC free-standing stores, MAC counters in department stores or partner doors. Not applicable to MAC Pro members or Estee Lauder Companies employees. Offer does not include the purchase of VIVA GLAM, gift cards; egift cards; sales tax; shipping and handling; items noted as not eligible; items that are not in stock at the time of purchase; pending purchases or purchases made prior to the start of the offer or after the offer ends. Offer applies to authorized purchases only. Only authorized orders will be processed and shipped. We reserve the right to cancel any order due to unauthorized, altered, or ineligible use of offer and to modify or cancel this promotion at any time. Other restrictions may apply.[/FONT]