Good question, I don't know if the prices for the cards are fixed. Maybe it will be an auction thing. But I don't think so.

According to @aggroed, there will be no limit to these cards. If the campaign is very successful, there will be many cards (bad for the buyers), the campaign will be less successful, there will be few cards (good for the buyers). It's a little poker, as usual.

If I have understood everything correctly, it is not important to be there early. You can also wait until the last day and then reconsider whether it is worth it.

But @aggroed does not give out exact information yet, we will find out tomorrow.