Guides
Short pieces on reading prices. Each one ends with live examples pulled from the same observation log the rest of the site runs on, so the examples are current rather than whatever was true the day it was written.
How often a price actually changes
How long today's price has held, and how far the item has swung, decide whether waiting is a plan. Neither number is the badge on the listing.
When Subscribe & Save is actually cheaper
The subscription discount is real, the coupon on top of it is real, and the price you end up with is often not the one advertised. Here is the arithmetic, and the three cases where it loses.
A “was” price is a claim, not a fact
The crossed-out price next to a discount is supplied by the seller and almost never audited. The only way to know whether a price is good is to compare it with what that same seller charged before.
When a price is actually worth taking
A price is worth taking when it is low against its own history at that retailer — not when the discount badge is large, and not because a sale has a name.