IL-2 1946 is 10 bucks on Steam I think. The amount of content you're getting for that price is staggering, and the gameplay is absolutely the best in flight simming, bar none. There is no DRM (beyond Steam's) that I know of, which is more than I can say for Wings of Prey.
"The assumption that animals are without rights, and the illusion that our treatment of them has no moral significance, is a positively outrageous example of Western crudity and barbarity. Universal compassion is the only guarantee of morality."