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
NTE Electronics NTE152 NPN Silicon Complementary Transistor for Audio Power Amplifier Switch, TO-220 Case, 4 Amp Collector Current, 90V Collector–Emitter Voltage: Communication Integrated Circuits: Amazon.com: Industrial & Scientific