So not a lot more than the $287.65 MSRP on the base fog lamp kit.
Do they light the scene better? On the base model with the base fog lamps, they definitely help. (On our old Impreza, by contrast, you hardly could tell they were on.) So swapping the base fog lamps on a '19 Forester out for the LEDs, is there a difference for the driver, or just for the bystanders? Adding a few bits of chrome to the front isn't my aesthetic; seeing better on dark rainy nights is though.