It seems that there is a fair bit of interest in mechs in 15mm at the moment. GZG released some for Salute. Big mechs that look like the mean business. A fair range of parts that can be played about with to get what you want. I can't put a link in here because they are not formally on sale although there are some details on the GZG website.
Critical Mass have had a few mecha out for a while. This one is the Combat Support Walker. This was has the feel of the AT-ST from Star Wars. Somehow it lacks the vibe of the GZG suit which seems to have the combat walker vibe but hey I am no fan of the Battletech style which this seems to have.
|Critical Mass combat support walker.|
|PA 3 Python Combat Armour|
Rebel Minis have been producing small scale mech for a while. I look at them and think that they are a manned version of ED-209. I have seen some of these in the flesh and they are pretty good minis.
|Rebel Minis Viper walkers|