Sparkfun

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US$2.10
These headers are made to work with the Teensy 3.2 and Teensy LC development boards. Each kit of headers makes your Teensy breadboard compatible and will allow for stacking a Teensy and Teensy-compatible shield board. This kit includes five headers (two 13-pin, one 7-pin, one 3-pin, and one 2x7 right-angle SMT), enough to connect your chosen Teensy in any configuration you need!
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US$2.73
Side-looking Infrared Emitters and IR Detectors. These simple devices operate at 940nm and work well for generic IR systems including remote control and touch-less object sensing.
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US$8.33

These SparkFun needle tipped multimeter probes are great for attaching to multimeters, power supplies, oscilloscopes, function generators, etc. Dimensions: 36" Long.

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US$1.33
This is a 5mm clear infrared LED. These devices operate between 940-950nm and work well for generic IR systems including remote control and touch-less object sensing.
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US$29.33
This is the newest 2.4GHz transceiver from Nordic Semiconductor, using the nRF24L01+ module. Dimensions: 0.8x0.9". This transceiver IC operates in the 2.4GHz band and has many new features! Take all the coolness of the nRF2401A and add some extra pipelines, buffers, and an auto-retransmit feature - very nice!
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US$2.09
This is an integrated Hall effect latched sensor. Holding a magnet near the sensor will cause the output pin to toggle. This makes for a robust presence sensor.
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US$14.46
These are very slim, extremely light weight batteries based on the new Polymer Lithium Ion chemistry. This is the highest energy density currently in production. Each cell outputs a nominal 3.7V at 1000mAh! Comes terminated with a standard 2-pin JST-PH connector - 2mm spacing between pins. These batteries require special charging.
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US$1.33
TRRS connectors are the audio-style connectors that you see on some phones, MP3 players and development boards. TRRS stands for "tip, ring, ring, sleeve," which reflects the fact that, unlike a standard stereo connector, this actually has three conductors and a ground.
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US$34.73

This provides a very easy way to start using MOSFETS for your next high current project. This shield allows you to use a computer power supply (or any other power source) to use your Arduino to switch high current. With RFP30N06LE MOSFETS, you can easily control a lot of current directly from your Arduino.

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US$1.39
They're great when you need a lot of color from not a lot of board space. Features: Viewing angle: 120 degrees. Red: (640nm) @ 250mcd. Green: (525nm) @ 880mcd. Blue: (470nm) @ 180mcd.
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US$20.93
The EasyDriver is a simple to use stepper motor driver, compatible with anything that can output a digital 0 to 5V pulse (or 0 to 3.3V pulse if you solder SJ2 closed on the EasyDriver). It requires a 6V to 30V supply to power the motor and can power any voltage of stepper motor.
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US$28.06
This plugs directly into your USB port and provides a programming socket for the ATTiny45 and 85. Just slot an ATtiny into the socket, plug the programmer into your USB port and start up the Arduino IDE.
Delivery within 2-3 weeks
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US$104.14

This GPS receiver is a complete GPS smart antenna receiver, that includes an embedded antenna and GPS receiver circuits. This low-cost unit outputs an astounding amount of position information 5 times a second. The receiver is based on the proven technology found in LOCOSYS 66 channel GPS SMD type receivers that use MediaTek chip solution.

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US$0.39
This is a very common 0.1uF capacitor. Used on all sorts of applications to decouple ICs from power supplies. 0.1" spaced leads make this a perfect candidate for breadboarding and perf boarding. Rated at 50V.
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Minimum quantity for "COM-08375 Capacitor Ceramic 0.1uF" is 5.

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US$5.53
This encoder is especially cool because it has a common anode RGB LED built in, as well as a push-button.
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US$6.85

This is a 12-step rotary encoder with a nice 'clicking' feel. It's breadboard friendly, and has a pretty handy select switch (by pushing in on the knob). The encoder is different from a potentiometer in that an encoder has full rotation without limits. 

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