I've found some codes, not sure how long they last:

STILACANDY gives you 25% off + free shipping. Not sure when this expires though, of if it's expired already, though i Think it lasts til 5/15. Worked for me though!

name of stilagirl of the week + 20 gives you 20% off + free shipping. e.g. say if the stila girl's name is sarah, then the code that will give you this discount is SARAH20 this is particularly useful for me, i find, because it means i can always get a 20% discount anytime, just change the stila girl's name :P

hope this helps some!