Sears sold it for $25 right? The official price drop for the game a long time ago was $30. I know because I bought a new copy for $30 a LONG time ago. So $25 isn't anything special. It's only considered that for a collector who never got one to begin with. Even at that point it wasn't easy to find so not sure why collectors wouldn't notice it until now.
If you're not a collector just call around to local game stores and get one used. If no one has it call again a month later or something. It's not common to see one but it does show up at gaming stores occasionally. Personally I liked the first one and Champions of Norrath better. The game is not worth over $30 unless you're a collector wanting a sealed version and even then that's pushing it. Between the first one, Norrath, and Return to Arms you'll get plenty of hack and slash action without resorting to paying more than $30 for BG II.