Adafruit

CA$11.45
The output ranges from 4.2V when completely charged to 3.7V. This battery has a capacity of 150mAh for a total of about 0.6 Wh. The batteries come pre-attached with a genuine 2-pin JST-PH connector as shown and include the necessary protection circuitry.
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CA$6.63

Instead of gluing, taping, epoxying, etc. use these elegant standoffs. They have these round hook things that are designed to grip standard 0.062" thickness PCBs either by the edge or by the corner. Comes in a pack of 4 with matching #6 thread forming screws. Ideal for use with up to 1/8" mounting material.

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CA$19.14
This is a basic charger set, and it does work, providing 3.3V DC output from the output half when the input half is powered with 9V to 12VDC. You can draw as much as 500mA if the coils are 2 or 3 mm apart.
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CA$21.07
90 degree viewing angle. You can plug these into a breadboard diagonally. These are Common-Anode type which means you connect one pin to 5V or so and then tie the other three legs to ground through a resistor.
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CA$28.76
Dimensions: 11.58mm / 0.45" x 22.75mm / 0.89" x 29.19mm / 1.14", Max Dimensions: 11.58mm / 0.45" x 32.74mm / 1.28" x 31.19mm / 1.22", Wire length: 131.67mm / 5.18",  Torque: 25 oz*in / 1.8 kg*cm @6V, Speed: 0.1 sec/60° @6V.
Delivery within 2-3 weeks
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CA$2.22
A simple breakout, 2x3 in the center, two 1x3's on the side. Plugs into any breadboard for neat wiring (in both nifty and clean senses of the word). Comes with a quality mini PCB, a 2x3 pin header and a small stick of 0.1" header.
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CA$8.36
A button is a button, and a switch is a switch, but this LED illuminated arcade buttons is in a class of its own. Its the same size as a 'standard' 30mm arcade but has a built in LED that can be controlled separately from the switch action - either to indicate or just to look good. 
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CA$19.14
16 ultra bright smart LED NeoPixels are arranged in a circle with 1.75" (44.5mm) outer diameter. The rings are 'chainable' - connect the output pin of one to the input pin of another.
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CA$28.69
These NeoPixel strips have 30 digitally-addressable pixel LEDs per meter and are very affordable and are only 12.5 mm wide, 10 mm if you remove the strip from the casing. This is the strip with black flex PCB, its identical to the white 30 LED/meter except it has a different color mask on the flex strip.
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CA$38.37
Instead of a L293D darlington driver, we now have the TB6612 MOSFET drivers with 1.2A per channel current capability (you can draw up to 3A peak for approx 20ms at a time). It also has much lower voltage drops across the motor so you get more torque out of your batteries, and there are built-in flyback diodes as well. Instead of using a latch and the Arduino's PWM pins, we have a fully-dedicated PWM driver chip onboard. This chip handles all the motor and speed controls over I2C. Only two data pins (SDA & SCL in addition to the power pins GND & 5V) are required to drive the multiple motors, and since it's I2C you can also connect any other I2C devices or shields to the same pins. This also makes it drop-in compatible with any Arduino, such as the Uno, Due, Leonardo and Mega R3.
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CA$19.14
This button has a domed white plastic cover with a black retaining ring around it. There's an optional LED included that will light up the button. The LED has a built in resistor so you can run it up to 12V but given the massive size and shallow depth of the button, it doesn't illuminate the entire button face evenly.
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CA$19.14
This button has a domed green plastic cover with a black retaining ring around it. There's an optional LED included that will light up the button. The LED has a built in resistor so you can run it up to 12V but given the massive size and shallow depth of the button, it doesn't illuminate the entire button face evenly.
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CA$19.14
This button has a domed blue plastic cover with a black retaining ring around it. There's an optional LED included that will light up the button. The LED has a built in resistor so you can run it up to 12V but given the massive size and shallow depth of the button, it doesn't illuminate the entire button face evenly.
Delivery within 2-3 weeks
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CA$19.14
This button has a domed yellow plastic cover with a black retaining ring around it. There's an optional LED included that will light up the button. The LED has a built in resistor so you can run it up to 12V but given the massive size and shallow depth of the button, it doesn't illuminate the entire button face evenly.
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CA$3.76
A high quality molded 2.1mm DC barrel jack is brought out to red (center positive) & black (ring negative) alligator clips. Works with just about every wall adapter, good for about 2 or 3 Amps of current and up to 24VDC.
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