Prime Day is brilliant, but the best savings aren't always at Amazon. Walmart has beaten the online giant's price for this Sony A7R IV camera, by over $200, but it could be ending soon!

Amazon outshines Walmart for long-term growth. Click to read more about their profitability, e-commerce edge, and valuation, and why I rate AMZN a Buy and WMT a Sell.

Amazon Prime Day officially got underway Tuesday, with the summer sales event slated to last through July 11. Competitors Target and Walmart are also holding multi-day sales events.

The best headphones for most new iPhone users are at their lowest price ever at Walmart, even less than Amazon's Prime Day sale.

Amazon Prime Day isn't the only major sale this week. Our shopping editors are keeping tabs on anti-Prime Day competitive sales happening across the Internet — including Walmart Deals, which runs through July 13.