Now that is all said and done, how do we calculate individually how much discount you got on each game over at Amazon? It doesn't tell you like FS/BB.
Well, what I did initially when pricing things out is pick three titles I knew were eligible, get a total, and then start adding individual items to see the net price difference.
Then I just said 'boy it looks to be the same ratio' and built a spreadsheet to take the item cost, divide it into the pre-promo discount subtotal, and then take that % and multiply it by the total discount to estimate the discount. Based on that, I picked which games to order through which retailer, and then confirmed my numbers on Amazon before hitting submit.
I might leave Codename Steam and KH2 in my FS cart and call them up about the discount% issue to see if they'll do anything. Worst case scenario I can always rip them out of the order later.