Stick with me here, i think what you are looking for is in thre (i tried the whole programming thing and it didn't turn out too well). Unless there is an easier way to get the link to put it into your cart
Are you an advocate?
Chances are you're not an Advocate so you won't be able to order it.
So I just realized "advocate" is even a thing. (Seriously, could they be any less informative about that? Is it mentioned anywhere on the RLS site?)
So when I add the Best of PSN set and go to checkout, it takes me to the checkout screen, but my total is $20 because it thinks I have two things in my cart when there's only one. And I have no idea how to empty it.
EDIT: So at the bottom of the Checkout screen, it says:
Items in your cart are no longer available or you have already ordered them. Please remove these items and submit your order again :* God of War: Ascension™
But there's no way for me to do that because I can't remove something that's not showing up in my cart. I may have just f'ed myself here.