General Suppliers

• McMaster - Lots of options (even metric) but expensive! Local pickup available.
• MSC Industrial Supply - Harder to use than McMaster but cheaper. Also local pickup.
• SDP-SI - Another good supplier of parts
• Small Parts - Source for smaller components not available elsewhere.
• WM Berg - Many Drive Trains, Especially unusual ones!

Metal Suppliers

Aside from McMaster and MSC we can also get metal cheaper from scrap shops and local vendors. Here are some important links:

• Yarde Metals - Large metal scrap, cheaper aluminum]]

Random Robot Parts

• Robot MarketPlace - Some good actuators/drive trains/chassis components. Note on this company, comparing their specs of their magmotors with those of the actual manufacturer, Robot Marketplace seems stretch things in some places, and then outright lie.
• Trossen Robotics