Sharpen Your Memory: Powerful Techniques to Boost Your Brainpower
Last checked: Apr 24, 2026
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Price History
Kindle price over time. Green zones = periods when the book was free.
Price has dropped 4 times over the last 21 months. Goes on sale roughly every 142 days.
Sales Rank
Amazon sales rank: lower number = better selling book. #1 is the bestseller.
Currently around #5,262K in the Kindle store — a niche title.
Rating & Reviews
Purple line = star rating over time. Blue area = total review count growth.
Not enough rating data yet. We'll show trends here once we've tracked more updates.
Currently ★ from 0 reviews
Sale Prediction
Actual Predicted
This book goes on sale roughly every 142 days. Next drop estimated in about 5 weeks. It has gone completely free in the past.
Prices shown in USD from Amazon US. We continuously pull new data to improve tracking. If dates look old, it usually means there has been no significant change since the last data point.
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