What’s the catch? Our usual free shipping policies apply. The $100 threshold is per order and is calculated after discounts but before taxes and shipping is calculated. Furthermore, if your order has pre-order / backorder items on it, we will hold the entire order till all items in the order are ready for shipping.
Of course, at the new $100 level, you should be able to split your orders quite easily to ensure everything that everything that is in-stock is in one order and everything that is a backorder on another.
Once again, this promotion is running for all of Summer and is scheduled to end August 31, 2016.