If cheap thrills and teenage kicks are right up your alley, you may be interested in this tutorial that shows you how to build a robot for $50. The kind of robot you can get for a measly $50 is actually pretty cool. It will stay inside a patch of sun and move around randomly until it’s brought out of the light.
Looking through the tutorial, I’d probably say the hardest part of this project is the electrical wiring or the programming if you’re not good with code. There are a few upgrades you can make to your robot too, just in case you found an extra $20 in your dirty laundry. Check it out and build one for your kids. I’m sure they’ll never stop thanking you.