If a e-book seems over a "Best Seller Listing*, I guess the generic "best vendor e-book" is ok, but I don't like it A lot. In any other case, "best-offering reserve* is exactly what I'd expect to describe a e book that sold or is providing perfectly with no reference https://share.evernote.com/note/2c41597a-5255-392d-5c16-2ebbd2d5ba50