Shipping is just not an option in the Reward Points category, period. It is assumed that the codes are e-mailed through Listia, but it does not mean that the physical codes (caps, etc.) can't be shipped. They can.
I prefer them by e-mail too. I'm just saying, in thic category, they don't let you choose the free or not free shipping method, whether you want to ship them or not. That is to prevent people from getting free credits by choosing free shipping on something that is typically sent by e-mail. I was making a general comment about why shipping says "not applicable". It is just not an option in this category is all I am saying.
Also, it looks like from your photo to be 6 12-pack codes from Coke Zero, Am I seeing that correctly?