Sparkfun

US$10.70
These metal push buttons are a very tough, small, panel-mount momentary switch with an illuminated yellow LED ring. It is a SPDT with 16mm threading and 1mm pitch.  This button is perfect for basic On/Off functions.
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US$10.70
These metal push buttons are a very tough, small, panel-mount momentary switch with an illuminated green LED ring. It is a SPDT with 16mm threading and 1mm pitch.  This button is perfect for basic On/Off functions.
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US$10.70
These metal push buttons are a very tough, small, panel-mount momentary switch with an illuminated blue LED ring. It is a SPDT with 16mm threading and 1mm pitch.  This button is perfect for basic On/Off functions.
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US$1.33
The Small sized GTE (Goes To Eleven) Knob can fit onto potentiometers with a 6mm wide shaft thanks to a brass insert with a set screw.
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US$5.36
This is an add-on for your RedBot that gives your robot the ability to detect lines or nearby objects. The sensor works by detecting reflected light coming from its own infrared LED.
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US$2.73
This is our new Hobby Motor now with a 6mm, 10 tooth, gear to make your basic projects a little simpler to manage. It works well for basic things like making a fan or spinning something pretty fast without much resistance.
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US$28.31
This provides a new way to prototype your project without a breadboard. Everything is wired together on a single board, which makes it easy to explore the possibilities of the components before snapping them apart and building them into your project.
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US$2.73
You may be wondering what sets this guy apart from the more common CR2032 coin cell battery, the answer is actually quite important. The CR2025 is actually 0.7mm thinner, than the CR2032, and is only rated at 165mAh. Some applications need a thinner battery to conserve space, and the CR2025 fits the bill.
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US$1.33
Do you have an R/C vehicle battery pack that desperately needs a Deans connector? With our new M/F Deans connector pair, you'll have just what you need to safely and securely connect your battery or anything else that requires a mini T Plug.
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US$40.63
RFID (radio-frequency identification) is the wireless non-contact use of radio-frequency electromagnetic fields, for the purposes of identifying and tracking tags attached to objects. This is the ID-3LA, a very simple to use RFID reader module from ID Innovations. With a built in antenna, the only holdup is the 2mm pin spacing.
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US$0.97
These LED holders accept a 10mm LED and mount into an 35/64" diameter hole.
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US$0.97
These plastic LED holders have a black finish and only need the LED and the holder to be snapped into place easily and effectively, no screwing anything into place. These LED holders accept a 5mm LED and mount into an 19/64" diameter hole.
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US$16.33

This is an excellent choice for anything that requires a small battery with a lot of punch. The voltage is low enough not to tax your regulating circuits, and the discharge rate is high enough to accommodate a lot of electronics and a few small motors. The battery has two cells and outputs 7.4V storing 1000mAh of charge.

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US$84.47
This is about 360 yards of conductive thread spun from stainless steel fiber and wound on a spool. You can use it as a creative way to connect various electronics onto clothing projects. This large spool is a great way to get into wearable electronics without a large upfront cost and a large enough quantity to not be afraid of making a few mistakes. 
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US$20.93
The MPU-6000 is a serious little piece of motion processing tech! By combining a 3-axis gyroscope and a 3-axis accelerometer on the same silicon die...
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