Amazon.com : Ardest Infrared Diode LED IR Emitter and Receiver for Arduino, Raspberry Pi, DIY Smart Phone TV Control (5 Pairs) : Electronics
100pcs Infrared LED Diode 5mm 940nm Powerful Laser Infrared Lamp Infrared LED 940 nm Diodo IR Infrared LED Transmitter 5 mm|infrared led 940 nm|940nm infrared ledir led 940 - AliExpress
Infrared Receiver LED 3mm
Super-bright 5mm IR LED (25 pack) [940nm] : ID 388 : $7.95 : Adafruit Industries, Unique & fun DIY electronics and kits