Actually I was being silly and did have enough store credit to do the whole thing (cash)free* by making use of the other sellers. Now let's just hope it is indeed the NEW copy they advertised. :)
* - what is the proper term for buying things via store credit? 'Cash-free' might just suggest that I'm using plastic or something. It's not truly free, as the credit had to be earned, but it's an incidental bonus rather than something I worked towards.