Adafruit

US$10.78
FSRs are sensors that allow you to detect physical pressure, squeezing and weight. They are simple to use and low cost. This sensor is a Interlink model 402 FSR with 1/2 diameter sensing region.
Delivery within 2-3 weeks
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US$3.42
Stack multiple plates, breakouts etc onto your Raspberry Pi with this custom-made extra-tall and extra-long 2x13 female header. The female header part has extra spaces to make it 13.6mm tall: when placed on your Pi, a PCB will clear the Ethernet and USB jacks.
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US$27.65
Features: 20 characters wide, 4 rows. White text on blue background. Connection port is 0.1" pitch, single row for easy breadboarding and wiring. Single LED backlight included can be dimmed easily with a resistor or PWM and uses much less power than LCD with EL (electroluminescent) backlights. And more.
Delivery within 2-3 weeks
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US$5.25
These are high quality battery clips. They're molded plastic so they wont tear like cheap clips, and they cover the battery terminals to prevent shorts.
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US$3.07
There are 20 pins, 10 on each side, with 0.1" spacing so you can easily plug it into a breadboard with plenty of space for wiring left over.
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US$6.92
64 yellow 235mcd LEDs are contained inside the plastic body, in an 8x8 matrix. 
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US$5.68
This proto-board is the PCB you always wish you had, but never realized it! We took the basic layout of a quarter-sized breadboard (basically, a 'tiny' breadboard plus power rails) and turned that into a beautiful PCB.
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US$4.38
They allow connecting of two sets of four wires together using just a flat-head screwdriver.
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US$1.67
These small sticky bumpers are our favorite accessory for any electronic kit or device. They are sticky, but not impossible to remove. They're small enough to fit onto any board, and have just enough height to give clearance to thru-hole soldered components.
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US$38.43
Circuit Playground Express is the next step towards a perfect introduction to electronics and programming. We've taken the original Circuit Playground Classic and made it even better! Not only did we pack even more sensors in, we also made it even easier to program. Start your journey with Microsoft MakeCode block-based or Javascript programming. Then, you can use the same board to try CircuitPython, with the Python interpreter running right on the Express. As you progress, you can advance to using Arduino IDE, which has full support of all the hardware down to the low level, so you can make powerful projects. At this time, this board does not support Firmata/Code.org - please use the Classic Circuit Playground (3000-ADA) if you are teaching code.org's curriculum.
Delivery within 2-3 weeks
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US$38.50
USBtinyISP is a simple open-source USB AVR programmer and SPI interface. It is low cost, easy to make, works great with avrdude, has both 6 and 10 pin standard ISP cables, is AVRStudio-compatible and tested under Windows XP and MacOS X, it may or may not work with your specific Vista/Windows 7 system.
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US$13.92
This is the Latching Mini Relay FeatherWing. It gives you power to control, and control over power. Put simply, you can now turn on and off lamps, fans, solenoids, and other small appliances that run on up to 250VAC or DC power using any Feather board.
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US$61.17
Measures 20 cm x 15 cm (7.9" x 5.9"), about 0.5mm thick. Its covered in what seems to be PVC, the panel is thus spill proof - but note that the connector is NOT waterproof, just a bit of heatshrink. This isn't something we would suggest leaving outdoors for extended periods.
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US$21.00
We've got 2.6mm thickness EL wire, with a pinkish 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 115 cd/m^2 or light and a half-life (50% brightness reduction) after 3000 hours of continuous use.
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US$42.00
A big, bold, beautiful blue LCD with white back-lit pixels. This LCD is the graphical upgrade to those popular 16x2 LCDs, but allows full graphical control.
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