Okay, so no relay!
Now that I've got the circuitry down, I'd like to make sure I'm not missing anything. So, my shopping list...
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Fingerprint reader - Fingerprint sensor : ID 751 : $49.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Electric strike - http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=160364888288&ssPageName=ADME:X:RTQ:US:1123
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2N2222 Semiconductor - 2N2222 PBFREE Central Semiconductor | Mouser
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Arduino Uno - A000066 Arduino | Mouser
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Mini Breadboard - Breadboard - Mini Modular (White) - PRT-12043 - SparkFun Electronics
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12VDC Power Adapter (x2) - Wall Adapter Power Supply - 12VDC, 600mA (Barrel Jack) - TOL-15313 - SparkFun Electronics
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Hookup Wire - Hook-Up Wire - Assortment (Solid Core, 22 AWG) - PRT-11367 - SparkFun Electronics
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Beginners parts kit SparkFun Beginner Parts Kit - KIT-13973 - SparkFun Electronics
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Resistor kit https://www.sparkfun.com/products/10969
If there's anything I'm overlooking, or if there's a better site to find it on (I'd like to get it all from the same place, but I know that won't happen), please let me know.
@johnwasser and @PaulS, you guys have been a huge help, thank you.