When I was a kid the prototypical DIY kit was a build-it-yourself crystal radio (for the princely sum of $24, well beyond my means at the time). Today's equivalent is DIY Artificial intelligence (AIY). "Google has released updated AIY Vision and AIY Voice kits that include what you need to get started. Both include a Raspberry Pi Zero WH board and a pre-provisioned SD card, while the Vision Kit also throws in a Raspberry Pi Camera v2." They cost $US 90 and 50 respectively, so they are actually cheaper (in relative terms) than the crystal radio.
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