Kits for Arduino
Grove - Starter Kit for Arduino is a complete kit that comes with all the essential components to help you get started with Arduino.
Myoware Muscle Sensor Development kit contains all elements that can detect the muscle activity.
Sparkfun sensor kit is a combination of all kinds of sensors in one single kit.
SparkFun MicroView - OLED Arduino Module is a display unit compatible for your Arduino,which reflects essential data from your Arduino board.
ARDX Maker's kit for Arduino from ProtoCentral is the gateway to studying Electronics in an interesting approach.