Pololu

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US$29.90
The S9V11F5 switching step-up/step-down regulator efficiently produces 5 V from input voltages between 2 V and 16 V. (Note: it requires an input voltage of at least 3 V to start, but it can operate down to 2 V after startup.) Its ability to convert both higher and lower input voltages makes it useful for applications where the power supply voltage can vary greatly, as with batteries that start above but discharge below 5 V. The very compact (0.3″ × 0.45″) module has a typical efficiency of over 90% and can supply a typical output current of up to 1.5 A when the input voltage is around 5 V.
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US$1.75
This connector is a double-row, 40-pin (2×20), straight female header strip designed to match 0.1" male headers.
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US$4.53

This extra-tall stackable 40-pin female header features two rows of 20 pins spaced with a 0.1″ (2.54 mm) pitch. It includes three 0.1″-thick spacers for additional clearance, and the extended pins allow multiple units to be stacked as popularized on Arduino shields. 

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US$38.92
This tiny (0.35″×0.45″) U1V10F5 switching step-up (or boost) voltage regulator efficiently generates 5 V from input voltages as low as 0.5 V. Unlike most boost regulators, the U1V10F5 automatically switches to a linear down-regulation mode when the input voltage exceeds the output.
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US$17.06
This compact (0.45″×0.6″) U1V11F3 switching step-up (or boost) voltage regulator efficiently generates 3.3 V from input voltages as low as 0.5 V. Unlike most boost regulators, the U1V11F3 offers a true shutdown option that turns off power to the load, and it automatically switches to a linear down-regulation mode when the input voltage exceeds the output.
Delivery within 2-3 weeks
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US$2.65
This connector is a double-row, 34-pin (2×17), straight female header strip designed to match 0.1" male headers.
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US$52.55
This small synchronous switching step-down (or buck) regulator takes an input voltage of up to 38 V and efficiently reduces it to 5 V. The board measures only 0.7″ × 0.7″, but it allows a typical continuous output current of up to 2.5 A. Typical efficiencies of 85% to 95% make this regulator well suited for powering moderate loads like sensors or small motors. High efficiencies are maintained at light loads by dynamically changing the switching frequency, and an optional shutdown pin enables a low-power state with a current draw of a few hundred microamps.
Delivery within 2-3 weeks
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US$54.55
This powerful step-up/step-down regulator efficiently produces an adjustable 4 V to 12 V output from input voltages between 3 V and 30 V while allowing a typical output current of up to 2 A when the input voltage is close to the output voltage and offering typical efficiencies of 80% to 90%.
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US$0.90

Can be used with ABRA's male headers SH series and other Pololu male headers. .100" (2.54mm) spacing. .100" x .100" matrix.

 
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US$2.73

These stackable 0.1" (2.54 mm) female headers are just the right height for connecting Arduino shields to Arduinos and other shields. The set includes: Two 1×6 female headers. Two 1×8 female headers. One 1×10 female header. 

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US$37.48
This powerful step-up/step-down regulator efficiently produces a fixed 6 V output from input voltages between 3 V and 30 V while allowing a typical output current of up to 2 A when the input voltage is close to the output voltage and offering typical efficiencies of 80% to 90%. Its ability to convert both higher and lower input voltages makes it useful for applications where the power supply voltage can vary greatly, as with batteries that start above but discharge below the regulated voltage.
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US$16.73

This is an adjustable boost regulator that can generate an output voltage as high as 25 V from an input voltage as low as 1.5 V.

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US$0.76

Can be used with ABRA's male headers SH series and other Pololu male headers. .100" (2.54mm) spacing. .100" x .100" matrix.

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US$37.48
This powerful step-up/step-down regulator efficiently produces a fixed 12 V output from input voltages between 3 V and 30 V while allowing a typical output current of up to 2 A when the input voltage is close to the output voltage and offering typical efficiencies of 80% to 90%.
Delivery within 2-3 weeks
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US$2.23

Can be used with ABRA's male headers SH series and other Pololu male headers. .100" (2.54mm) spacing. .100" x .100" matrix.

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