Apple Certified Refurbished still looks like new; Amazon and Walmart refurbs cost less, but come with trade-offs

Patience is the cheapest upgrade in Apple’s lineup. Skip launch day, wait a few months, and you can buy a Certified Refurbished iPhone, iPad, or Mac that Apple says is indistinguishable from new — typically for about 15% less. That pitch is looking more crowded. Amazon Renewed and Walmart Restored now sell the same products at steeper discounts,...