I followed the link and, yes, it indeed says '$15. minimum' (paraphasing).  I received two 'Coupon with Sugar on Top!' emails (I assumed it was an email hiccup), identical and with no mention of a minimum. 

Edit:  Not actually an edit, because i caught this before hitting 'post'.  In both emails, the words/lines above the coupon code are black on a black background, rendering them and their message invisible.  It wasn't until I just now highlighted that section that it became visible.  Can't say that finding this out after the fact and only because i intended to copy and paste made me very happy.  No part of a message or email should be in black on a black background.