Adafruit

US$7.63
The first thing to note is that this sensor does not provide an 'analog' output like many of our electret microphone assemblies. So it's great for chips that do not have analog inputs. Secondly, the digital interface is a very simplistic pulse density modulation output. It's digital but its notPWM and it's not I2S. You will need to make sure your chip has a PDM interface - most 32-bit processors these days do!
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US$7.73
This mini USB hub has four USB 2.0 ports each with a max total transmission speed up to 480 MBps. All four ports are powered thru the USB micro-B cable. There's also a single on-off switch that controls the four USB ports.
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US$7.88
There are 16 pins on the side, 8 on each, with 0.1" spacing so you can easily plug it into a breadboard with one row on each side for wiring it up.
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US$7.88
64 amber 235mcd LEDs are contained inside the plastic body, in an 8x8 matrix. 
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US$7.88
Make your own custom DE-15 cable or DE-15 interface with ease, using this DE-15 Socket to Terminal Block Breakout. You get a nice solid PCB with an DE-15 socket and two strips of terminal blocks that you can use with stranded or solid core wire to quickly assemble your own wiring jigs.
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US$7.91
It's pressure-sensitive: squeezing it will reduce the resistance, so it's handy for making flexible sensors.
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US$7.95
Measuring approx 1" x 6", this standard-thickness FR4, gold plate ruler has the most common component packages you'll encounter. It also has font size guide, trace-width diagram, and a set of AWG-sized drills so you can gauge your wire thicknesses.
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US$7.98

Perfect for portable Arduinos, motors, solenoids, 12V LED strips, etc. An On/Off switch lets you control the power right at the source without unplugging. Batteries not included. Dimensions: 1127mm x 71mm x 19mm (5in x 2.8in x 0.76in). Attached lead + plug is 14cm/6in long. Weight (without batteries): 75g.

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US$8.55
This cable by Adafruit will make it easy for you to enclose a device that has an Ethernet port.
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US$8.67
This is an inverter for EL wire and tape, similar to our pocket inverter, except it is a brick that takes 12V input instead of 2 AA batteries.
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US$8.67
This breakout board features the easy-to-use MCP4725 12-bit DAC. Control it via I2C and send it the value you want it to output, and the VOUT pin will have it.
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US$8.67
This is a fixed mounting stand to fit a laser diode module.
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US$8.67
This breakout PCB set will make your life much much easier and get you prototyping faster than ever. One side has a 8-TSSOP/8-MSOP pin out with traces going to two rows of 0.1" spaced holes, the other has 8-SOIC. Solder your chip to either side and you're ready to rock on any solderless breadboard. 
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US$8.67
This breakout PCB set will make your life much much easier and get you prototyping faster than ever. One side has a 12-TSSOP pin out with traces going to two rows of 0.1" spaced holes, the other has 12-SOIC. Solder your chip to either side and you're ready to rock on any solderless breadboard.
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US$8.67
This breakout PCB set will make your life much much easier and get you prototyping faster than ever. One side has a 14-TSSOP pin out with traces going to two rows of 0.1" spaced holes, the other has 14-SOIC. Solder your chip to either side and you're ready to rock on any solderless breadboard.
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