I got that it was free shipping on any order for mine, not sure why that wasn't popping up for yours as well. Maybe try contacting customer service?
I see the problem. I clicked past the first screen, which said "Free shipping", but stopped when it asked what ship method I wanted, b/c it showed $5.49.
BTW, trail mixes and pistachios are included on this deal too. 3 bags of shell on, 3 bags of shelled, $11