If you can't buy one, and won't make one then candles is the best bodge-job. If you have a Wii you could put its sensor bar under (or above) the screen, turn the Wii on (with the Wiimote already connected to the computer), get it past the health and safety screen (as it doesn't power the sensor bar before this) and use this sensor bar, but that uses more power than simply powering a sensor bar, as the Wii has to be on too.
OS: Windows 10 64 bit Professional
CPU: AMD Ryzen 5900X
RAM: 48GB
GPU: Radeon 7800 XT
CPU: AMD Ryzen 5900X
RAM: 48GB
GPU: Radeon 7800 XT