User blog comment:AltHistoryGeek/Got HOI3 now, been playing it like crazy!!/@comment-5018798-20121221103359/@comment-32656-20121221112511

Gamersgate is probably the best spot. They've got a big sale on a lot of games right now, and the HoI 3 Collection is $30 right now. The Game itself is $10.

About the only place you're going to find it right now. Considering how long it has been since I saw it in stores last, and Paradox is getting out of that market, you're not going to find it there, realistically. An independent shop might have something still, but I doubt it.