I can get the Expansion Pass over at Steam for $14.99 on sale right now. Unfortunately, I have the GOG version and apparently this means I can't take advantage of that great sale. So here I am, looking at GOG's Expansion Pass for $24.99 and feeling like maybe it's a good time for GOG to start price-matching Steam on things like this, or at least keep up with their sales on big items.

Of course, I also think it's silly that I can't buy my Expansion Pass anywhere and use it. Oh well.

Yeah it would be nice, wouldn't it.

I ran a quick search around for you, unfortunately yet again, Steam has the best sale price. What's worse, even the W3 GOY edition is 24.99, the same as the Expansion Pass on GOG.

I would love for them to offer the steam key instead, but I know that's against their DRM-free stance. Not that it solves your issue.

Come back and complain when GOG has a Witcher 3 sale and Steam does not.