The news of Amazon’s $13.7 billion acquisition of Whole Foods Market this summer came with a bit of irony: Many bricks-and-mortar supermarkets in New Jersey and elsewhere had offered online delivery for years, but Whole Foods wasn’t among them. But at the very least, the deal signaled to those other operators that Whole Foods is not to be taken lightly, especially with Amazon’s stated goal of lowering the chain’s notoriously high prices.