Locus's weekly bestseller column tracks what moves in specialty SFF channels - indie bookstores, genre distributors, and backlist staples - separate from the New York Times mix where a single breakout can dominate.
If you're an author comparing numbers, it's the "what sells in the community that actually hands you a convention badge" slice. For readers, it's a shopping list grounded in shop data rather than TikTok spikes.
(Shortened and summarised to avoid devaluing the source)