Okay, here we go. These are the best parts that I found from before after numerous hours of searching.
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Regulator - "Simple Switcher" 5v 3amp
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Inductor - 47uH, 3amps
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Input capacitor (probably overrated, but the bigger, the better) - 50V 470uF
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Output capacitor - 16v 330uF
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Diode - 40v 5amp
Cost not inluding shipping/handling for these parts:
$7.56. Not too expensive! But then you will have to add ~$15 more for shipping/handling. I realize that it isn't very conveniant to order from 2 different sites, but they are just where I found the optimal parts.
These are not the only options for parts, as one could choose smaller (in size) parts that would work, but I tend to like to be conservative when it comes to these things.
SH Z-Car, Custom Crawler, 8s Savage,
12s XTM XLB 1/7 buggy,
4wd 4-link rear/IFS Pro4 truck,
Custom Hyper 10 Short Course,
Belt-Drive Mammoth ST 1/8 truggy, 4s 17.5 MM Pro HPI Blitz