RobotShop provides a detailed step-by-step tutorial on how to build your own robot. From the RobotShop home page, hover over the Community tab and then select How to Build a Robot from the drop-down menu.
You can master building simple robots with a basic knowledge of robotics and mechanics, for less than $100, as of 2015; with more experience and education you can complete larger, complex robots that typically cost much more to make. You can build robots for many purposes including household tasks, surveillance and competitions.
RobotShop provides robotics kits, partially- and fully-completed robots, and drones. Scientific Direct also provides robot building kits, magnetic robot kits and completed robots.