Reddit reviews Logisaf 36 LEDs 5mm 850nm Round IR Infrared Board Round Plate 90 Degree
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Just a few cheap IR leds hooked to a 5v power supply or a couple batteries should be plenty of IR for a camera at close range.
$7 and runs off 12v: https://www.amazon.com/dp/B01MU0VIME/
(probably under-volt it so it's not too bright it's made for cameras that light an area, not something 1' away)