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Under $5

Breadboards and everything breadboardable - now even more affordable.
USB jumper cable with alligator clips

USB jumper cable with alligator clips
ATmega328P-U microcontroller

ATmega328P-U microcontroller
ATtiny84-20PU Microcontroller

ATtiny84-20PU Microcontroller
1.5m USB extension cable

1.5m USB extension cable
Infrared Transmitter LED Module

Infrared Transmitter LED Module
Obstacle Avoidance Sensor Module

Obstacle Avoidance Sensor Module
Pushbutton Module

Pushbutton Module
Heartbeat Detector Module

Heartbeat Detector Module
Active Buzzer Module

Active Buzzer Module
DS1302 Real Time Clock (RTC) socketed on breakout board (no battery)

DS1302 Real Time Clock (RTC) socketed on breakout board (no battery)
FR207 2A 1000V Fast Recovery Diode

FR207 2A 1000V Fast Recovery Diode
USB to Mini-USB cable

USB to Mini-USB cable
Optical Break Detector / Photo Interrupt Module

Optical Break Detector / Photo Interrupt Module
Vibration Switch/Detector Module

Vibration Switch/Detector Module
XY-axis Joystick Module

XY-axis Joystick Module
MAX4466 Electret Microphone with Amplifier Breakout

MAX4466 Electret Microphone with Amplifier Breakout
Tilt Switch Module (Digital)

Tilt Switch Module (Digital)
Mercury Tilt Switch Breakout

Mercury Tilt Switch Breakout
Hall Effect Switch Module (44E 402)

Hall Effect Switch Module (44E 402)
Analog Hall Effect Sensor (49E)

Analog Hall Effect Sensor (49E)
Mercury Tilt Switch + LED Breakout

Mercury Tilt Switch + LED Breakout
Line Tracking Module

Line Tracking Module
Laser Diode Breakout (Red)

Laser Diode Breakout (Red)
Temperature Sensor Module (NTC Thermistor)

Temperature Sensor Module (NTC Thermistor)