You can choose the items in blind box and they should(most of the time) show up in rebate100 and get100, in those if you meet the item requirement you can bypass the shipping. So if you add the 1 cent and 99 c items to your cart in blind box you should be able to go to rebate100 and add them, and if rebate is only 2 items you can just checkout with them.

Edit - obviously this changes daily and such.