If you're scouring through Amazon during October's Prime Day event, youâ ll likely notice that prices ebb and flow. Sometimes, costs can fall and shoot right back up within a week or so. Knowing ...

I used to fall for flashy discounts and so-called limited-time deals until I found Keepa. It's a handy tool that collects and analyzes price data and sales trends for products sold on Amazon. Now, I ...