Adafruit

US$1.74
Its a JST 2.5mm 'free hanging' cable assembly that latches strongly. One wire is marked with a white dashed line. You can't plug these in backwards.
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US$5.25
This is the "I made something with a Beagle Bone" badge for use with educators, classrooms, workshops, Maker Faires, TechShops, Hackerspaces, Makerspaces and around the world to reward beginners on their skill building journey! 
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US$4.24
The buttons screw in place, so you can use with up to ~15mm thick material, and will cover up if the hole if it isn't perfectly round and clean. The action is smooth, without a strong click, yet you can definitely feel when the button is pressed. A tiny micro-switch is pre-installed, with gold plated contacts.
Delivery within 2-3 weeks
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US$16.63
12 ultra bright smart LED NeoPixels are arranged in a circle with 1.45" (37mm) outer diameter. The rings are 'chainable' - connect the output pin of one to the input pin of another. Use only one microcontroller pin to control as many as you can chain together! Each LED is addressable as the driver chip is inside the LED. Each one has ~18mA constant current drive so the color will be very consistent even if the voltage varies, and no external choke resistors are required making the design slim.
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US$13.13
Its great for connecting things together, soldering to perf-boards, fits into any breadboard, etc. We go through these guys real fast, and thought that given how handy they are, we'd offer them in a pack of ten!
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US$8.67
Pin down that PCB with our Toggle Clamp, a sturdy and reliable way to quickly press and release with precision!
Delivery within 2-3 weeks
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US$17.42

The product kit comes with: A fully tested and assembled LED backpack. Ultra-bright 8x8 yellow matrix. 4-pin header. A bit of soldering is required to attach the matrix onto the backpack but its very easy to do and only takes about 5 minutes. 

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US$29.95
The TV-B-Gone is a kit that, when soldered together, allows you to turn off almost any television within 150 feet or more.  It works on over 230 total power codes - 115 American/Asian and another 115 European codes.  You can select which zone you want during kit assembly. This is an unassembled kit which means that soldering is required - but it’s very easy and a great introduction to soldering in general.  The kit’s powered by 2x AA batteries - that aren’t included - and the output comes from 2x narrow beam IR LEDs and 2x wide-beam IR LEDs.
Delivery within 2-3 weeks
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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$8.67
Instead of soldering wires to your perf board, solder in these 0.1" pitch terminal blocks. There's a little spring contact so you can pull back on the plastic bit and slip in your 20 to 26 AWG solid or stranded-core wires. Each terminal block is electrically isolated from those next to it.
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US$3.42
This is the 1/4" (6.35mm) Stereo Plug Terminal Block. It's a pretty common size and is super useful for more heavy duty connections - like a modular synth, amplifier or an electric guitar.
Delivery within 2-3 weeks
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US$6.92
Now you can hook up your LiPo Charger or a Arduino Micro/Leonardo/Raspberry Pi using the same cable. Approximately 8" long from end to end. This cable does not contain a hub, so you can only connect one USB device at a time (to either end). The micro end does data and power, the mini side only does power (not data).
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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$1.93
This cable will let you turn a JST PH 3-pin cable port into 3 individual wires with high-quality 0.1" male header plugs on the end. Great for extending and connecting sensors.
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US$3.85
Add a teeny analog light sensor, the ALS PT19 analog light sensor is a great way to upgrade a project that uses a photocell and needs RoHS compliance. Due to the high rejection ratio of infrared radiation, the spectral response of the ambient light sensor is close to that of human eyes.
Delivery within 2-3 weeks
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