Listen people.. geez...
IT HAS NO MINIMUM PURCHASE REQUIREMENTS. It can be $1 for all it matters. The remaining balance of the coupon just gets voided since it doesn't apply for shipping. If it doesn't work for you online, call em up. It was fast, easy, and painless for me, as it was for other people as they have posted.
So basically if it's say a $5 item, w/ $3 shipping. By using the coupon, you only have the pay shipping. Got it?