I see. Well, the main problem as I see it is not having to contact you through e-mail to get a discounted price from steam, is someone buying it as "On Sale" on your site when the game is already back to full price.
I agree completely. That's one of the main things I'm trying to eliminate with the updates to my script. In cases where that happens I always refund the order, but I know that's small consolation when the game you wanted to grab with Bitcoin is no longer on sale. In any case, I'm working on the update and I'll put a mention of it on the news section when it's live. For now the best thing to do in the case of sales you don't want to miss that are mis-priced is to try and notify me at least an hour or two before the sale will end. I usually see emails pretty fast so as long as there's enough time to get a couple of confirms on your payment before the sale ends, I can usually fulfill the order.Quote
Anyways, sent you a mail about Binding of Isaac DLC, Wrath of the Lamb, waiting for you to update that list 
I've added the DLC 