I thought the upgrade and save coupons only applied to in-stock items - by nature this excludes preorders.
I had a BB rep on the phone and my order has confused the hell out of her. I preordered at $52.99 and applied $50.29 credit to it ($45 RZ, $5.29 GC). By my calculations, instead of having to pay a remainder, I actually should have a balance left on the GC after all said and done. I was just calling to confirm that would actually be the case
The problem is that the tax on the order right now shows at $0.70 for whatever reason that they don't understand (should be $5+), and they can't actually apply an $8 credit to get the $52.99 price down to $44.99 in the order. So I think their answer is to refund me the difference onto my credit card, which shouldn't even be used for the order... I'm not entirely sure, but she said she'd write detailed case notes so I can call back the day I get the item.
This is why I like Amazon more for preorders...