Slim DIN Rail Mount NPN to PNP/PNP to NPN Sensor Logic Signal Converter Module: Amazon.com: 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: 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
NPN PNP Transistors, Ltvystore Silicon Power Transistor Assortment TO-92 Box Transistors Assorted Kit Set BC327/ BC337/ BC517/ BC547/ BC548/BC549/BC550/BC556/BC557/BC558, Pack of 500: Amazon.com: Industrial & Scientific