I know there are other posts about covers for the Bull and other grills. But I am just posting the cover I picked up on Amazon on sale. Seems to be a heavy duty cover that will last a while. Got 1 for the Bull and one for my Weber gasser.
Unicook Grill Cover 65 Inch,... https://www.amazon.com/dp/B088FT16P9?ref=ppx_pop_mob_ap_share
Unicook Grill Cover 65 Inch,... https://www.amazon.com/dp/B088FT16P9?ref=ppx_pop_mob_ap_share