I have to say that it is well worth buying >£60 worth of E.L.F products, because then when the discount is applied, it is >£30, which also gives you free shipping (UK only). Remember you can always group up with friends and family members and buy as one order (incase your total doesn't reach £60!).
I'm planning to pick up a few products (including a repurchase of the mineral foundation), and hopefully they'll still be in stock before the weekend is over!
Let me know if you decide to get anything from E.L.F =)