GOG.com has "IL-2 Sturmovik: 1946" for $1.99
"IL-2 Sturmovik: 1946" is a 2006 compilation release of "IL-2 Sturmovik", a World War II combat flight simulator. It includes the original IL-2 Sturmovik™ and all four of its addon packs. This release adds 36 new planes, four new maps, over a hundred new ground objects, and nearly 200 new campaign missions. It's DRM-FREE, i.e. No activation or online connection required to play.
Here is the link: