In one of our grocery stores, it's in with the soups, bouillon, & gravy. In the other it's with the spices.
Kitchen Bouquet comes in a dark brown bottle with a yellow label. The bottle is round, but gets progressively smaller towards the top. The bottle is ~6" tall, I guess.
Gravy Master comes in a 4-sided bottle - also tapered. I think it's also dark brown, but I can't remember what color the label is. The bottle is shorter than KB's.