Electric linear acuators
http://www.firgelli.com/index.php
Leimbach hydraulic systems & other items they make. They don't speak english & I don't think they sell direct to the individual, but here's all the goodies they make.
http://www.leimbach-modellbau.de
This german model shop sells Leimbach, Wedico & several other products. They communicate in english.
http://www.ttm-shop.de/content.php?s...12&hersteller=
This is where my John Deere 850 excavator came from.
http://www.vario-earthmovers.com/
This is the guy that designed the JD/Hitachi excavator, he offers other construction model kits of his own making, as well as individual parts. He communicates in good english.
http://www.fumotec.de/