The 20% off coupon which expires Feb. 1 can be used on most prestige brands such as Lipstick Queen, Pur Mineral, Bare Escentuals, Smashbox, Tarte, Too Faced, Laura Geller, Philosophy, and more, including prestige nail and hair care brands.
Taking this information directly from the coupon itself excluded are: hair extensions at the salon, fragrance, Lancome, Clinique, Perricone, Dermalogica, Urban Decay Naked3 (can be used on all other Urban Decay), Benefit Brow Bar, and Beauty Steals.
I hope that helps clarify it.