For those interested in indie books, Patty Jansen has her monthly list of more than 100 SFF book promotions for 3-4 September at
http://pattyjansen.com/promo/ She seems to be alternating between free one month and $0.99 the next month. This is not her personal production: she authored only one of these books.
The list of books is already there, and some are already available now at $0.99, depending possibly on chosen reseller. The 3-4 September date is when they are all supposed to be available for $0.99
Note that some are not first in series, and the previous ones in the series may be also cheap, or free. It may be worth checking.
I will not make recommendations, for lack of precise or personal information. I looked at star ratings, but they have low value. But If anyone has advice, I am interested.