JinKazaragi: I have a question about that insomnia sale everyone is talking about since I never seen one before, as far as I understood it's games are sold with a high discount but only a limited number of those games.
Assuming you put one of those games in the cart is it "reserved" then or could it happen that I want to pay and suddenly the store says too late it's gone?
They get reserved for some short period of time. When you click, it sends you to checkout. I doubt you could wait hours, but GoG definitely lets you have time to checkout...well at least the last time it ran.
I don't believe you can leave it in your cart indefinitely or even until the next one though...