Right now you can get
$30 worth of make up from ELF Cosmetics for $15 from Groupon. With prices ranging from $1-$15 you should be able to get some fun stuff for $30 from their website.
The $30 credit does not include shipping but
ELF does run Free Shipping promotions, or free magazine subscriptions with your orders pretty often. Normal shipping is around $5-$6.