Love this imperial milk stout, need suggestions

My mother gifted this bottle of Rhino Bones Alesong imperial milk stout and it’s great. I’m new to terminology but what comes to mind is savory and slightly sweet without bitterness that I attribute to more casual (lager?) beers. What also surprised me was a lack of the alcohol taste. I’m not looking for anything at an exotic price but due to my immediate approval of this stout, I want some suggestions. Is anyone familiar with this brand? I’ve been told that this specific bottle was made for some type of anniversary, I don’t remember what for but they were given out to a handful of people.