The 28 events observed produced no real discount.
The current price of $17.99 matches the lowest point recorded in the past 365 days. It marks a 74% drop from the calculated typical price of $69.96, well below the more commonly reachable floor of $52.53.
That $52.53 mark was hit only 7 times over the year, holding for just 25 days total, which shows how uncommon a drop all the way to $17.99 really is. The price moves infrequently, changing on average every 18 days, and none of the 28 shopping events tracked produced any real additional discount.
Given that pattern, waiting for a Prime Day or Black Friday sale likely won't help, since those events haven't historically moved this price at all. With the all-time low reached and a clear downward trend over the last 90 days, this appears to be the strongest buying opportunity seen so far.