Well, I put 13 shirts into my cart and then attempt to check out. At the place order screen I get this error:
Please fix the error(s) below.
1. We're sorry, but we no longer have enough inventory of this item to successfully place your order. If you have more than one of this item in your shopping bag, decrease the quantity and try again. If you only have one of this item in your shopping bag, please check the 'remove' box next to the item.
They don't say which item it is and there are no errors in the card to indicate anything. Pretty crappy.