Sensors 10pcs Iron Pack Si Phototransistor 3DU33 for Arduino: Amazon.com: Industrial & Scientific
Vishay Intertechnology BPW77NA Phototransistor Silicon Chip, NPN Transistor, Visible Light, 850 nm 3-Pin, 5.5 mm W x 6.15 mm H x 5.5 mm L (Pack of 2): Amazon.com: Industrial & Scientific