Studies & data
Original research from our price database — every figure is computed from real, continuously tracked Amazon US prices and is free to cite with attribution. Updated July 2026.
The Real Cost-Per-Unit Index
What everyday products actually cost per unit across nine categories — the cheapest, the median, the most expensive, and the spread between brands. Updated monthly from continuously tracked prices.
Read the study →The cheapest month to buy everyday products
When each category hits its annual low on the US retail calendar — Prime Day, back-to-school, Black Friday, post-holiday — plus the typical price per unit right now.
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