I have the Cinevate Proteus Rail (60cm) system with an extra rail block, Cavision shoulder mount, and DV-Tec Eng rig to support your camera & stuff's weight on your belt. Used once.
The Cinevate Rail System cost me over 480 with shipping from Canada. The Cavision Shoulder mount was 99+ shipping from B&H, and the ENG rig was 200 from Ebay. I'm asking $450, shipping and insurance included.