Adafruit

US$21.88
The top side has a white silkscreen, and the same markings you're familiar with, to make transferring components easy. The bottom has the 5-hole pad design that matches a classic breadboard, with 4 power bus lines on the sides, and no mask so you can easily cut traces when necessary.
Delivery within 2-3 weeks
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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$5.14
The STEMMA QT connectors on either side are compatible with the I2C connectors. This allows you to make solderless connections between your development board and the QT Shifter or to chain it with a wide range of other sensors and accessories using a compatible cable.
Delivery within 2-3 weeks
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US$1.67
This potentiometer is a two-in-one, good in a breadboard or with a panel. Its a fairly standard linear taper 10K ohm potentiometer, with a grippy shaft. Its smooth and easy to turn, but not so loose that it will shift on its own.
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US$7.23
The Adafruit LTR-303 Light Sensor a simple and popular low-cost I2C digital light sensor that is easy to integrate into your project for reliable and wide-ranging light measurements.
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US$10.42
This button is a momentary push button, when you press it the 'normally-open' contact shorts to the common contact. When you release it, the contacts open up again. The switch and LED are separated, so you could wire it to turn on when pressed or vice versa or whatever you wish!
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US$7.23
The Adafruit LTR-329 Light Sensor a simple and popular low-cost I2C digital light sensor that is easy to integrate into your project for reliable and wide-ranging light measurements.
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US$7.23
The ADAFRUIT 5545 is a GPIO Expander Breakout - an affordable 8-channel I2C expander.
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US$27.25
The 5543-ADA is a high-quality sensor that integrates two powerful chips to create a strong and reliable motion, direction and orientation sensor!
Delivery within 2-3 weeks
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US$5.17
 These stickers are a must for anyone making a breadboarded Arduino-compatible. They fit right on top of a DIP ATmega328 (or '168) chip, and clearly indicate every pin as it would be called in the Arduino IDE.
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US$5.25
This is the "I use Linux!" 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$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$1.68
The 5462-ADA is a 50mm 18 pin connector.
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US$4.05
The 5445-ADA is a small antenna that supports 2.4GHz WiFi or BLE.
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US$2.68
The 5385-ADA is a 400mm 4 wire connector. It is fitted with JST-SH and has a solid latch that makes it easier to insert.
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