Adafruit

US$11.55
Powers off of 2 AA batteries (not included!), it can drive 1 to 8 feet (about 2.5m) of our high-brightness EL wire for 10 hours. 
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US$17.42
This little DC/DC boost converter module can run from 1.8V batteries or higher, and convert that voltage to 5.2V DC for running your 5V projects.
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US$38.50
Control the flow of fluid using the flow of electrons! This liquid valve would make a great addition to your robotic gardening, aquarium, or pool project. There are two 1/2" (Nominal NPT) outlets.
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US$8.67
Each strand comes with 12 LEDs, approximately 5cm/2 inches apart for a 2 foot long strand of wire. At one end of the magnet wire, a double stranded-core wire is soldered on and heat-shrinked to protect it.
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US$43.67

Includes: 10cm x 10cm (approx 4"x4") square panel in Aqua, Portable 4xAAA inverter powerful enough to drive a single panel, 4 x AAA alkaline batteries to power the inverter and panel for 10 hours.

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US$22.95
This chip can control 24 separate channels of 12-bit PWM output. Designed (and ideal) for LED control, this board is not good for driving servos.
Delivery within 2-3 weeks
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US$12.17
Compared to low cost CdS cells, this sensor is more precise, allowing for exact lux calculations and can be configured for different gain/timing ranges to detect light ranges from 188 uLux up to 88,000 Lux on the fly.
Delivery within 2-3 weeks
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US$42.35
Alert tower lights are really easy to use. The brown wire is the common +12V power line, then the other wires are connected to ground to activate each of the three LED lights: red wire for red light, yellow wire for yellow light and, you guessed it, green wire for green light. The final orange wire is what controls the buzzer which will sound continuously when the wire is grounded. We did notice that you can't have both the yellow and red lamps on at once, and in general its best to only have one lamp lit at a time for max brightness. The buzzer can be turned on whenever, it does not seem to be affected by the lights.
Delivery within 2-3 weeks
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US$12.17
Trinket may be small, but do not be fooled by its size! It's a tiny microcontroller board, built around the Atmel ATtiny85, a little chip with a lot of power. We wanted to design a microcontroller board that was small enough to fit into any project, and low cost enough to use without hesitation. ATtiny85 on-board, 8K of flash, 512 byte of SRAM, 512 bytes of EEPROM.
Delivery within 2-3 weeks
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US$30.95
This lovely little display breakout is the best way to add a small, colorful and bright display to any project. Since the display uses 4-wire SPI to communicate and has its own pixel-addressable frame buffer, it can be used with every kind of microcontroller. Even a very small one with low memory and few pins available!
Delivery within 2-3 weeks
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US$18.48
We've got 2.6mm thickness EL wire, with a clear coat, pre-cut and soldered to a standard quick-connect EL wire. It is made with the latest technology and twice as bright as 'standard' 2.3mm EL - running it at 1.5KHz/90V it emits 150 cd/m^2 or light and a half-life (50% brightness reduction) after 3000 hours of continuous use. Draws about 10mA per meter. The capacitance is about twice that of 'standard' EL, 11 nF/m so if you're using an inverter, it will drive only half as much high brightness wire as standard.
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US$24.50
A stepper motor to satisfy all your robotics needs! This 4-wire bipolar stepper has 1.8° per step for smooth motion and a nice holding torque. The motor was specified to have a max current of 350mA so that it could be driven easily with an Adafruit motor shield for Arduino (or other motor driver) and a wall adapter or lead-acid battery.
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US$28.00
There are 30 RGB LEDs per meter, and you can control the entire strip at once with any microcontroller and three transistors. The way they are wired, you will need a 9-12VDC power supply and then ground the R/G/B pins to turn on the three colors.
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US$34.92
We wanted to make it easier for people to get these LCD into their projects so we devised a shield that lets you control a 16x2 Character LCD, up to 3 backlight pins AND 5 keypad pins using only the two I2C pins on the Arduino!
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US$17.24
This Mini External USB 2.0 Speaker does not require or use a 3.5mm audio jack. You'll get great audio, even with a device that doesn't have a head phone jack. And since it is powered over USB, there's no need to charge it by other means, merely plug it into your desired device's USB port and listen to the audio flow. Compact and convenient to carry, it's simple and practical. With 2 built-in speakers and no battery or adapter needed, this plug-and-play speaker is perfect if you need a quick and portable audio solution.
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