Don't know if this has already been posted anywhere but I couldn't find it.
Gap and Old Navy always advertise free shipping over 50.00 and I always added something to my cart to make sure I hit 50.00 and just returned what I didn't want.
BUT last week I found out that as long as the total before the discount code is 50.00, you'll still get the free shipping over 50.00 even if you total after the discount is under 50.00.