Exactly, the value is in the fact that it's bundled: instructions and everything you need to make the circuit, exactly the same components used in the manual.

Exactly, the value is in the fact that it's bundled: instructions and everything you need to make the circuit, exactly the same components used in the manual. As for getting assorted components to complement these bundles or other projects: SparkFun makes it easy for the US. But being in the EU (and caring about ROHS and CE) I use these to fill the gap: http://www.exp-tech.de/ http://www.exp-tech.de/ https://www.tinkersoup.de/en/ https://www.tinkersoup.de/en/ http://www.watterott.com/ http://www.watterott.com/