Sparkfun

CA$3.00
This is a simple 6 ft. long 2.5mm audio cable. It is terminated with a 2.5mm audio plug on one side and unterminated with bare wires on the other end. These are to be used with the ModKit shields.
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CA$3.00
TRRS connectors the audio-style connectors that you see on some phones, MP3 players and development boards. TRRS stands for "Tip, Ring, Ring, Sleeve," which reflects the fact that, unlike a standard stereo connector, this actually has three conductors and a ground.
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CA$3.00
These Photoluminescent stickers can be cut to size or shape for indicators, decoration or emergency illumination. We were surprised at how brightly these panels glow after being 'charged up' with a bright light source.
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CA$7.95
These come in a variety of sizes and this is a pack of 10 small storage cubes that can be individually snapped apart and reattached. Of course they're compatible with all other sizes of modular storage box so you can build custom panels of storage compartments. Outside: 25x30x22mm. Inside: ≈18x17.5x18mm.
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CA$7.95
These come in a variety of sizes and this is a pack of 4 medium storage cubes that can be individually snapped apart and reattached. Of course they're compatible with all other sizes of modular storage box so you can build custom panels of storage compartments. Outside: 75x30x22mm. Inside: ≈67x17.5x18mm.
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CA$4.51

BNC connectors are ideal for quick connects to audio coax and high-frequency signal lines. This is a right-angle connector and comes with a lock washer and nut.

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CA$23.31
The 7-Segment Serial Display combines a classic 4-digit 7-segment display and an ATMega328 microcontroller allowing you to control every segment individually using only a few serial lines.
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CA$92.23
The WonderBeeps board is a really simple way of adding wireless capabilities to your next project. Simply connect a standard electret mic, supply 3-5VDC and play the Beeps! The Beeps are transmitted at around 8Khz so they can be heard but they can be embedded within other sounds to make them almost unnoticed.
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CA$30.69
This is a simple serial to USB board that works with the nRF24L01, nRF2401A, and RF-24G Nordic transceivers. Comes with an ATMEGA328 preloaded with code that allows the transceivers to act as pass through serial devices (sends 4 characters at a time).
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CA$1.46
This has the same number and spacing of pins as the Raspberry Pi so you can easily connect via ribbon cable to the low-level peripherals and get hacking! 
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CA$4.54

This 2x13 flat ribbon-cable fits the GPIO headers on the Raspberry Pi so you can easily connect to the low-level peripherals and get hacking! 

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CA$5.00
This is a 1" tall 4-digit 7-segment display that is big enough to see from a distance but not so big that you'd have trouble finding an enclosure for them.
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CA$4.54
These common-cathode displays feature 4 x 7-segment digits and one decimal point per digit.
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CA$2.69
 These 1" tall 4-digit 7-segment displays are big enough to see from a distance but not so big that you'd have trouble finding an enclosure for them.
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CA$2.69
These common-cathode displays feature 4 x 7-segment digits and one decimal point per digit.
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