You can’t put a price on free!
MekTek has released Mechwarrior 4 for free. This re-release was actually announced back in July 2009, but Microsoft didn’t want to clear the rights. For some reason they have now.
You can download Mechwarrior 4 at: http://www.mektek.net/projects/mw4
Here’s a trailer for the upcoming Mechwarrior 5:
Here’s the intro to Mechwarrior 4:
Intro to Mechwarrior 3:
Intro to Mechwarrior 2: