This is my first time I am really following big sale on GoG, and thus hoping that TA: K will be discounted, but unfortunately that's not the case. Will there any chance that this game be discounted later before Winter Sale ends ?

On steam, all games that will be discounted are already discounted from the beginning of the sale through the end of it, how's it for GoG ?

I've seen it at $2.99 on and off for the past two months.

You may have better luck contacting support directly.

Yeah, I am thinking to get it on Winter Sale but it's not on sale..I used to be on Steam, it was apparent that a game will be on sale from the start to the end of sale but I have no idea in here. Hopefully it will be, before the sale ends.