Three years out, this story almost sounds like something I dreamed up, but on March 18, 2012, my Kindle Daily Deal for the first three books of The Righteous series was upgraded to a Gold Box Deal. The three books were on sale at 99 cents apiece. On that day, they sold 115,000 copies in total, and the scope of the visibility was such that I sold several thousand copies of my unrelated books and pushed two other books to #20 and #22 in the overall store. There might have been one other in the top 100 as well, but the day was kind of a blur.
Incredibly, the three books topped out at a ranking of 2, 3, and 4. 60,000 copies of the first book wasn't enough for the top rank in the store. #1 that day was The Hunger Games. This was the week of the release of the first Hunger Games movie. And of course Hunger Games was at full price and #1 in every store everywhere. I'm guessing Suzanne Collins had a pretty nice royalty check that period.
Mine was pretty good, too.
I've never had a day remotely like that, and can't imagine the circumstances where that could possibly happen again.