Sparkfun

CA$2.33
These panel-mounting rocker switches have built-in indicator lights to let you know when your switch is engaged. They mount into a 20.2mm diameter hole and are rated up to 16A @ 12v.
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CA$1.48
Your project will probably need an on/off switch. If you plan to house the project in an enclosure, we found this great rocker switch to help you out. RoHS and UL approved.
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CA$5.41
 A simple slide potentiometer can go a long way. Rated at 10kOhm and 0.5W. Comes with solder lug connections. 
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CA$3.45
This is the knob that connects to the linear slide potentiometer.  Knob has a nice friction fit onto slide.
Delivery within 2-3 weeks
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CA$6.46
These are various leaded cables for attaching to multimeters, power supplies, oscilloscopes, function generators, etc. Cables come in red/black pairs. Dimensions: 36" long.
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CA$8.95

These are various leaded cables for attaching to multimeters, power supplies, oscilloscopes, function generators, etc. High quality coax cable with stress relief sleeves. Dimensions: 36" long.

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CA$23.00
The BNC probe kit includes a 20MHz professional probe with hook and tip as well as a couple converters to connect the probe to either a BNC jack, RCA jack, or a PCB mount. This kit was designed for use with our Digital Oscilloscope Kit, but there are sure to be a variety of other uses.
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CA$8.58
These are various leaded cables for attaching to multimeters, power supplies, oscilloscopes, function generators, etc. Dimensions: 36" Long.
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CA$9.15
This is an inexpensive HDMI cable that you can use to hook up your Raspberry Pi to a suitable monitor or TV. Heck, you can hook up anything you want with it, HDMI is becoming more and more common as a digital audio/video standard.
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CA$16.11
These are various leaded cables for attaching to multimeters, power supplies, oscilloscopes, function generators, etc. 5 pairs of IC Hook to IC Hook test leads. Comes with Black, Red, Blue, Green, and Yellow colored leads.
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CA$7.62
Ribbon cable is really helpful in situations where you need to make a lot of connections without a big mess of wires. Nothing makes a project look more finished than a nice clean wiring harness.
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CA$1.48
Ribbon cable is really helpful in situations where you need to make a lot of connections without a big mess of wires. Nothing makes a project look more finished than a nice clean wiring harness.
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CA$4.54
Ribbon cable is really helpful in situations where you need to make a lot of connections without a big mess of wires. Nothing makes a project look more finished than a nice clean wiring harness.
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CA$1.15
Ribbon cable is really helpful in situations where you need to make a lot of connections without a big mess of wires. Nothing makes a project look more finished than a nice clean wiring harness.
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CA$6.08
This is a standard issue USB 2.0 cable. This is the most common A to B Male/Male type peripheral cable, the kind that's usually used for printers. Compatible with most SFE designed USB boards as well as USB Arduino boards like the Uno.
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