No sorry, we do not allow this at help. The group is there for help only.
In November 2022, we started allowing this and on one weekend, we had 25 books posted by people, and only had 300 members at the time. By Monday morning it looked like the Book Bolt Marketplace.
So we had to stop allowing people to do this, you can imagine with over 2,500 members now how many posts there would be now if we still allowed this.
Also, most people don't want more competition with their books and by posting your book, you are showing it to over 2,500 people and a few will probably do the same or very simular thing.