Try Iron Wind Metals. They've been producing almost the entire range of
BattleTech/MechWarrior miniatures for quite a few years now, taking over from Ral Partha/FASA. I have all the Clan Mechs, including the original designs and new resculpts. Also, I have Horizon's vinyl Mad Cat, Armorcast's Mad Cat and Vulture, and Ral Partha's museum scale Mad Cat, Vulture and Atlas. When
Mechwarrior 4: Vengeance came out, a special Mad Cat slightly larger than the museum scale version was produced...and yes, I have that, too.