A few things have sold out. Meanwhile, discounts on multiple Kindle Essentials bundles have gotten even bigger.

Amazon Prime Day sales looked bumpy at first this week, with year-over-year comparisons for the first two days down. But by Friday, early data showed solid sales for the tech giant despite economic uncertainty.

The four-day summer sales event officially ends tonight, Friday, July 11. This is the tech giant's 11th Prime Day event during which the online retailer offered up millions of deals over more than 35 categories including electronics and kitchen , apparel and accessories.