I see, a regular bug then. Thanks for answering, and thanks for the reminder—I'd probably miss the sale. I already own the sequel, but the first one wasn't on sale at that time.

Oh hey, sorry I didn't recognize you by your nickname (I'll try to memorize that there Gadget's less attractive distant cousin twice removed). I do know your site, and I do use it every now and then, as you probably expect, most often to check all time best prices. I like the most recent layout and style updates by the way! Good salesmanship though, smooth! I always kinda envy people ready to pounce like this.

Next time I see a conflicting price, I'll know where to check. Didn't occur to me.

Also—speak of the devil—I've been wanting to ask you a semi-related question, I'm off to your GameSieve thread, see you there. And thanks again for the answer, I know it's a bit funny but I like the closure of finding out what was wrong with stuff.

Hey.
Am i the only one who can buy stuff in USD for the past couple of days?
No euros or PLN to choose from.
Thanks.

Where does it say it thinks you are?
Bottom of the checkout page, this bit, "By placing the order, you agree to the GOG.com User Agreement and confirm that you are currently located in"

GOG got its location detection wrong. This happens sometimes. Put anything in the cart, go to the checkout page, and it'll run the detection again with more accuracy, almost certainly getting it right this time, allowing you to change to PLN again.
Alternatively, delete the gog_lc cookie (In Firefox: F12, storage, cookies) and reload.

No idea, probably US since that is the only currency i can see.
Didn't know about this cart trick.
Thank you!

I still have the same problems, and none of these solutions helped :(

Same here for BRL.

I used to buy it all the time with my Brazilian card. Since last month, it says "We couldn't confirm local pricing for this checkout, so a region-free pricing has been applied. If this seems incorrect, please try again with your default connection settings." and the prices are updated.

Funny that my patron subscription works just fine with the same account.

This doesn't sound "same" at all. So far the common bug has been that people couldn't select their local currency, but only USD prices, while it sounds like you see prices listed in BRL just fine, but only have an issue on checkout? I haven't ever seen that particular message reported before.

Just to confirm: You're not using a VPN when this happens? (Because it very much sounds like an anti-VPN measure.)
Have you tried opening a new private window, logging in there, and then seeing if you can buy something at Brazilian prices? If that works, then clear cache and delete cookies in your main browser window, and this should be solved.
If the new private window gives the same message, then GOG's location detection service doesn't know how to handle your IP address / erroneously classifies it as a VPN. Contact support, specifying both when this started, your IP address, and that the behaviour remains the same in a new private window. You might need to tell them a few times before they'll escalate to somewhere capable of adjusting their location detection.