Where can I obtain some of these, preferably pigtails (or even just the ends): Female DC Power Supply Plug to PC Case Fan Power Adapter Cable
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So it's a standard Molex thing and their website links out to the exact item at a handful of vendors. 19 cents each instead of the 7 bucks at NewEgg. 🎉
https://www.molex.com/en-us/products/part-detail/2078410003