Klarus C8 Eight-Cell Multi-Battery Charger

To be fair, as a photographer, I often have 2-3 sets of four batteries to charge. But overall the lack of power per slot would concern me with this product.

Not much of a savings. It is being sold on Amazon for $39 with next day delivery. What's the point of buying it here.

The new egg item you listed is sold by https://www.newegg.com/VirVentures/about not new egg. Here's there direct store: https://virventures.com/. Not sure they are US based. For battery junction "Every Order Ships Directly From The United States Authorized Dealer For All Products Sold." This means that battery junction has no inventory and are acting as a marketplace these items are likely shipped from China. If there is no FCC compliance (and labeling is a part of that compliance, and I'm not seeing FCC labeling) for items containing microcontrollers, these sales would also be illegal.