Hello Philipp, yes, it is a steep surcharge, but since the new price was about 600.-, it was clear to me that the super price cannot be permanent. (at the moment it costs an average of 385.- online) but keep in mind that you have delivery times of about 4-6 weeks everywhere and here you will have it at home in 3-4 days, so that will probably cost you.
I think the Mobicool is great, I've been using it for about 6-7 days now, it's brilliant :)