These are not on sale, but I was quite happy to notice that all of PF Chisholm's Sir Robert Carey books are available as e-books from PPP now. A couple of month ago, only the last one was available as an e-book. I read one of the middle ones in this series many years ago in DTB from our local library's book sale, and quite enjoyed it. So, I'm happy to see them out as e-books now, so I can read the series in order.
Now I just have to decide whether to wait, and assume they'll make the first one available for $0.99 soon, or to go ahead and splurge a bit, and get it full price. (Yes, I know these are reduced and/or couponable at some other e-books stores, but I sort of like buying from PPP direct occasionally, because I like how they are doing their e-books.)
This Robert Carey series is set in Elizabethan England, so if you like historicals, you might give them a try.
Now I just have to keep hoping that PPP will get the rights to do e-books of Michael Pearce's Mamur Zapt series, which is my second favorite mystery series of all time.