A request was made to sticky a post about book promo services that have proved reputable and are currently performing well.
A good starting point is here:
http://nicholaserik.com/promo-sites/. However, promo is highly category specific, and this data is time sensitive. A site that is a good performer at the beginning of the year might have already begun to lag later in the year. We can keep this thread updated with current results of campaigns per genre.
This is a crowd-sourced information thread on current performance. What has given you results lately ? Please state the particular genre if the promo service caters to specific genres. (Genres to be added as this post fleshes out.)
General Use:Bookbub -- Considered by many to be the holy grail of promotions. Expensive, hard to get, and their vetting process has a reputation for being nonsensical. But widely touted as impossible to beat for exposure and results.
EReader News Today (ENT) Fussy LibrarianBargain Booksy and FreebooksyFree Kindle Books and Tips (FKBT)Science Fiction/FantasyBook Barbarian Second only to Bookbub for this genre, and very reasonably priced.
RomanceSteamy RomanceRobin's Reads (free promotion)Thrillers/MysteriesBooks Adrenaline