What is a really great toy for a 15 year old boy that's not an electronical gadget?
That depends on what he's into, but being a 15 year old guy myself, I can attest that we aren't interested in much besides electrical gadgets and accessories for those gadgets.
15 year olds need toys? Get him/ her a book or guitar :)
I would say a bike or skateboard?
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Tech deck, board game, rc car, or gift card.