RN-41/42 bluetooth module breakout boards, available from SparkFun Electronics
PRT-10255
PIC32 Development board, available from SparkFun Electronics.
SparkFun Arduino ProtoShield - Bare PCB. Manufactured by and available from SparkFun Electronics.
Product 10724 9 DOF Sensor Stick
Breakout board for TMP102 digital temperature sensor
A PCB to combine four individual strain gauges or load sensors into the standard wheat bridge configuration and 4-color wiring found on load cells.
The Beefcake Relay Control Kit contains all the parts you need to get your high-power load under control.
ATmega32u4 XBee compatible Arduino available from SparkFun Electronics
C++ library and example for using SparkFun's PWM block for the Intel Edison.
Breakout board for common telephone connector and cable. Handy for I2C connections.
LilyPad Coin Cell Battery Holder with on/off switch, made by and available from SparkFun Electronics.
Breakout board for Freescale's MAG3110 Triple Axis Magnetometer
LilyPad Arduino SimpleSnap, manufactured by and available from SparkFun Electroncis