Question about Call of Duty 2

So it's Halloween, and for some reason as a younger person years ago I started playing Call of Duty 2, and I continued to do it every Halloween, but it's been a few years since I've been able to do that since my copy is long gone.

So my question is here, is there anywhere Call of Duty 2 is on sale? I have about $10 in my account, and can't afford the $20 it is on steam. Since I want to relive the enjoyment I got out of the game, and do not wish to torrent