Well, free shipping over $100+ and 3 free samples deal are more or less always there, but 15% off on your purchase is relatively (it's not always on at least) rare.
Samples come in a little packet that's more or less for one usage.
Anyways, details for the promotion:
15% Off Everything
Promotion expires 2am AEST, June 3, 2015. Cannot be applied to previous purchases or combined with other offers. Applies to in-stock products only; no rain checks.
FREE Standard Shipping on $100
Promotion expires 2am AEST, June 3, 2015. No cash value. Applies to Australia and New Zealand only.
3 Free Samples
Promotion expires 2am AEST, June 3, 2015. Choose any 3 from 12 available FREE samples on orders of $5+.