Transistors
Contributors:
jimblom
Purchasing Transistors
Now that you're in control of the source of control, we recommend a SparkFun Inventor's Kit to bring your newly found knowledge to life. We've also provided links to a semiconductor kit and single transistors to insert into your own projects.
Our Recommendations:

SparkFun Inventor's Kit Add-On Pack - v4.0
KIT-14310
$25.95