CarrionCrow: You're welcome. =)
My advice would be to avoid the key resellers when it comes to GOG. If you're not getting it from here, you run the risk of something going wrong. GOG has no authorized key resellers, so if you see keys they're coming from grey market vendors who might be using stolen credit cards to get codes.
There are sales here frequently. Every Monday to Wednesday, and every Friday to Monday, and that's not counting large sales that show up every few months. You can save a lot of money along with being confident that every game purchase is legal and valid by shopping directly from the store here.
Key re-sellers is a grey market. As such, I have a libertarian friend who focuses exclusively on the market word and sees nothing wrong with it.
I usually want to smack him on the head, but he always foots the bill when we go out for tapas, so I don't.
Stolen credit cards would make it a "black market" since we're talking stolen goods.
Ebay can be a sort of a grey market as well. That's actually how I got my nook.