600Pcs 15 Kinds of Values X 40 Pcs NPN PNP Transistor TO-92 Kit Set with Plastic Box: Amazon.com: Industrial & Scientific
Hilitchi 24-Values 2N2222-S9018 / BC327-BC558 NPN PNP Power General Purpose Transistors Assortment Kit - Pack of 840: Amazon.com: Industrial & Scientific
Amazon.com: Digital Counter, Easy Connection NPN PNP Signal Input Stable Electric Counters Auto Detection for Industrial Control : Industrial & Scientific
NPN PNP Signal Converter, MRI-24TR/INV PLC Sensor Polar IO Level Conversion Module, PNP to NPN Signal Converter Relay: 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