From their website:
FREE SHIPPING ON EVERYTHING ALL SEASON LONG Free shipping eligible items have Standard Shipping automatically selected in your cart. Select Marketplace items, some scheduled delivery items and items displaying "In Store Only" message are not available for free shipping. Free shipping valid 10/25/151/2/16.

There is a bit of a contradiction when their site says "FREE SHIPPING ON EVERYTHING" and the details say there are exclusions. I always worry about Marketplace items as these can't be returned to the store.