Adafruit

US$5.17
This little dongle will let you connect one of our 5V 2Amp or 5V 10Amp adapters to something that expects to connect to USB. The premise is simple - one end has a USB A female jack and the other has a 'standard' 5.5mm OD/2.1mm ID barrel jack with center positive polarity. 
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US$23.03
This solenoid in particular is nice and strong, with a 40mm long body and a 'captive' armature with a return spring. This means that when activated with up to 12VDC, the solenoid moves and then the voltage is removed it springs back to the original position, which is quite handy. Many lower cost solenoids are only push type or only pull type and may not have a captive armature (it'll fall out!) or don't have a return spring. This solenoid has 4xM3 (metric) threaded holes in the bottom for easy mounting.
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US$8.96
These emit UV 'blacklight' in the UVA spectrum so they are great for projects with fluorescent materials referred to as UV/blacklight-reactive or 'glow-in-the dark'.
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US$30.63
Turn any surface/wall/table etc into a speaker with a surface transducer. This type of speaker does not have a moving cone like most speakers you've seen. Instead, a metal rod is wrapped with the voice coil.
Delivery within 2-3 weeks
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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$2.53
This 1.5" diameter speaker cone is the perfect addition to any audio project where you need an 8Ω impedance and are using 0.25W or less of power. We particularly like this cone as it's very simple and its plastic body is extremely lightweight and thin.
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US$8.67
This A/V RCA Cable for Raspberry Pi is a great way to turn your Pi 2, A+ or B+'s output into a full on composite video and audio device.  Simply connect the cable to your Raspberry Pi's 3.5mm jack and the other side into whatever device you're looking to connect to and get full RCA visuals and sound.
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US$34.92

This project pack contains: 2.5 meters (over 8 ft) of high-brightness, long-life EL wire in Red, Pocket EL inverter runs on 2 AA Alkaline or rechargeable batteries (not included), 2 inches of heat shink, both 1/8" and 1/4", 2 inches of copper tape, 2 inches of foam tape.

Delivery within 2-3 weeks
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US$13.13
This is the perfect addition to any audio project where you need 4 ohm impedance and 3W or less of power. This is a set of two 2.8" x 1.2" speakers. We particularly like these speakers as they are small and enclosed for good audio volume and quality.
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US$10.86
This thread is 2 ply, a little thicker than every day polyester or cotton thread but still thin enough to be sewn by hand in medium-eye needles or with a sewing machine that can handle 'heavy' thread. Because it is strong and smooth, its ideal for any wearable/e-textile project.
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US$1.75
CdS cells are little light sensors. As the squiggly face is exposed to more light, the resistance goes down. When its light, the resistance is about 5-10KΩ, when dark it goes up to 200KΩ.
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US$26.95

The product kit comes with: A fully tested and assembled LED backpack. Ultra-bright 4-digit 1.2" tall red seven-segment display. 5-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. 

Delivery within 2-3 weeks
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US$3.07
They're what you see on the back of nearly every synthesizer and drum machine. These are nice sturdy jacks, and breadboard-friendly, with all the pins on 0.1" spacing for easy wiring.
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US$5.17
Add another 16 pins to your microcontroller using a MCP23017 port expander. The MCP23017 uses two i2c pins (these can be shared with other i2c devices), and in exchange gives you 16 general purpose pins. You can set each of 16 pins to be input, output, input with a pullup or open drain.
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US$138.53
Included are plenty of parts to make a few different fun projects! There's a Flora motherboard, a GPS module that can also perform location datalogging, eight ultra-bright chainable RGB pixels, a battery holder and batteries, two types of our high quality stainless steel thread, alligator clips to help you test out your parts, a USB cable for reprogramming the Flora, and some parts to make a wearable remote control (or TV-B-Gone!): NPN transistors, long range IR LEDs, and matching resistors.
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