Lamb also said the modular method just makes more sense when scaling. Smart carts can cost retailers between $5,000 and $10,000 per unit and require a lot of maintenance compared to simple shopping carts, which tend to cost retailers less than $100 and will get beat up for years before being replaced. Amazon's walk-out tech is expected to cost retailers upwards of $1 million for installation and hardware, and that doesn't include maintenance over time. Currently, the full system that it's piloting is about $75,000 and includes 10 carts, an imaging station, a server station to run the system, full integration into a customer-facing store and Imagr support over the duration of the pilot. Imagr didn't share how much its current model of trolleys cost versus its modular system, but says it'll be a cheaper endeavor.

If the realization that Labor Day is just around the corner brings to mind all the fall essentials you've been meaning to get, you're in luck. Earning its nickname of being the Everything Store for the umpteenth time, Amazon is currently stacked with deals on trending items, devices, gadgets and more. The sales and deals team at Good Housekeeping did a deep dive into the best deals on Amazon ahead of the holiday weekend and found, to our delight, that a number of our readers' favorite brands and products loved by our Good Housekeeping Institute experts are already on sale.