Scholast Store coupon problem

I just tried to use the coupon listed on SR's page AFFEARTH and this is the error I received (the first time I entered the code it did nothing):

"The promotion code has exceeded its usage limit. Please enter a new promotion code below or leave the promotion code field empty and complete the form and/or click CONTINUE. "

I think their site is acting up anyway. It took me several tries to get through the billing/address page. My info is stored bc I've ordered from them before but it kept telling me I couldn't change it. I finally got passed it and it wouldn't take the shipping off.

I have a feeling that it's probably free shipping if a certain amount spent, but that's not what SR has. On their site they have another code listed free shipping over $50 but not the same as above.

Thanks!

Its actually over 49.00. LOL