Amazon.com: NPN PNP Switching Transistor Set, in-line Triode TO-92 Power transistors Assorted Assortment Box Kit, Range 2N2222-S9015 & BC327-BC558, 24Value, Pack of 960 : Industrial & Scientific
Amazon.com: PNP NPN Transistors Kit, Three Pins Silicon Power Transistor Assorted Assortment Box Set Range 2N3904-MPS2907, 10Value,Pack of 200, by Ltvystore : Industrial & Scientific
Amazon.com: NTE Electronics PN2907A Silicon PNP Transistor Audio Amplifier and Switch, TO-92 Package, 45ns Turn-On Time, 0.8A Continuous Collector Current, 60V Collector-Emitter Voltage (Pack of 5) : Industrial & Scientific