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My kids want to get into robotics, where Online can I buy the motors (dc,ac,stepper...) and mechanical assembly (nuts, bolts, sheet metal, springs, rods...) for a very affordable price, you know I just want to get a big box of all this stuff and let them tinker around with it. Even where to find cheap microcontrollers, leds, wheel bearings, wheels and tracks, sensors...

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Go to ebay and type things like arduino robot into the search bar and use search descriptions. Anything you click on will if you scroll down have a section labeled people who bought this also bought. Its a way to do a tour of what people have been buying.

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