[Fanatical]Baldur's Gate I+II: Enhanced Edition[historical low]

playing the long game

might take half a decade or more.

Looking at Larian's past discounting habits, it wouldn't be unreasonable to assume a range of 4-7 years from release before it gets to the -75% that Original Sin 1 is at. Perhaps we'll see a fluke, but I don't see it likely falling the 2-3 Euro range even within half a decade, based off Larian's precedence. (That is, to put emphasis on your "or more".)

Bright side, with BG3 out and Divinity: Fallen Heroes coming out soon, maybe we'll finally see a better sale on Original Sin 1. It's been about where I'd normally be deliberating getting it, but since Remote Play is still finicky for me (in regards to who I can enable it with), I'm looking at having to buy two copies just to play, and that's still high enough to bring me over budget. :(

In any case, not holding my breath on BG3 getting into budget any time remotely soon- the higher price tag as well as the arguably higher and/or broader appeal [given the franchise in question and that turn-based is generally more accessible an option] suggest it'll take at least as long to get into budget range for a single copy as two copies of Original Sin would [relative to release], even after accounting that I'd probably set a higher limit on where I'd be willing to buy for BG3.

Though, well, reviews for BG3 are presently lower than for OS/OS2, so a lot really'd depend on how Larian handles BG3's continued Early Access development. Being that it's Larian, though, I'd assume that's not much of a concern.

So, to tweak Vahid's comment below..

playing the long game