I asked Moles and he said they don't have a set date at the moment. I would imagine the better it sells = the longer it stays.
I was pretty concerned about the mega box expiration date, since its described as being available for a "very limited time". Really, I just want to make sure I'm not going to be missing out, as I plan on buying one "SoonTM". As long as there is some sort of notice, that's ok. Also, I would like to point out that I WAS going to only buy one box, MAYBE two. So, it's had the intended effect of increasing the average purchase, at least in my case (hint, hint).
Yes I live in country that has ascended Switzerland. Instead of having free education. I get paid to be educated. Or maybe I can't ask my father to use his credit card for 50 dollars on games when I'm in the middle of my finals.