Can anyone help me with a cheap hydraulic motor+oil tank+arm?

Where can I buy\build one cheap?

Has anyone been able to create one without spending a lot of money?

Something like this http://www.rigidrc.com/shop/hydraulic-accessories/482-hydraulic-kit-for-tamiya-1-14-truck.html

Thanks!!

bump...

Guess..since no one is into hydraulics...I'd switch to a linear actuator.