If a e book appears on a "Best Vendor Record*, I suppose the generic "best seller e-book" is okay, but I don't like it much. Otherwise, "best-promoting book* is exactly what I would assume to explain a guide that sold or is selling very well without the need of reference https://adelaidehealthfoodstore.sport.blog/2025/07/22/adelaides-best-indian-supermarket-ethnic-indian-grocer/