I saw that they might be purchased for around £80, which, as you said, would constitute a simple solution.
Nonetheless, even if the wheel bearing is functioning well, it is likely that the Reluctor Ring is deteriorating. (I have implemented a provisional solution on one of my devices by placing a washer behind the ABS Sensor.)
I am astonished that one of my rear bearings is producing noise, since the vehicle has only accumulated 90,000 km.