Depends on the paid ad. I've had very good results with BookBub and ENT Bargain Books promo for when I've run 99 cent sales.
The BookBub ad in particular more than paid for itself several times over.
And ENT Bargain Books is great because what you pay is tied to how many you sell.
The BookBub ad in particular more than paid for itself several times over.
And ENT Bargain Books is great because what you pay is tied to how many you sell.