For a limited time Lifepixel is offering 25% off any infrared or other camera conversion with coupon code 10DAY2021A or $100 off on their already converted cameras (plenty of Nikon DSLR and mirrorless) with coupon code 10DAY2021B. You can read about the different types of conversions here:
Hawaiian infrared time-lapse of haunting Mamane trees made with IR-converted Nikon D5200 camera