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So this is probably outside of scope, but I do feel necessary to point out there's a how to build a Mars Rover guide from NASA! It might be fun to read. Or I might just be a nerd.
A subscription to Make Magazine would be a good starting point, wherever you are. Arduino has some good starter kits that are relatively affordable, and will help your child learn about electronics. Instructables is another great resource - you can look at the category 'Circuits' and the channel 'Robots'. There are step-by-step instructions, as well as lists of the components you'll need to make each project.