Quote Originally Posted by Mando Knight View Post
They've recently released the 25th Anniversary Introductory Box Set, though it came a bit late. My university's gaming association's resident mecha GM bought the box when it came out, and his BattleTech group got to help him break it in.
There's also megamek/mekwars, which are free, legal implementations of the ruleset. Megamek is the tabletop engine itself, while mekwars is campaign software.