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Whole Foods is Watch Salyut 7 Onlineabout to get a lot cheaper for Amazon Prime customers—as well as everybody else.

The online shopping giant said Thursday that it will offer supermarket discounts to members of the program starting when the $13.7 billion deal is expected to close next Monday.

The company also said Whole Foods' famously steep prices would be lowered across the board for all customers.

Prices will be lower on a wide variety of products including bananas, eggs, salmon, tilapia, kale, lettuce, ground beef, apples and, yes, avocados, according to an Amazon press release.

"We're determined to make healthy and organic food affordable for everyone," said Amazon Worldwide Consumer CEO Jeff Wilke in a statement. "Everybody should be able to eat Whole Foods Market quality — we will lower prices without compromising Whole Foods Market's long-held commitment to the highest standards."

An Amazon spokesperson called the initial discounts a "down payment on that vision" and said there would be "more to come" in the future.

Amazon said it's already upgrading Whole Foods' payment platforms to make its Prime membership program the official customer rewards program for the stores.

Among Amazon's other plans for the grocery store are installing Amazon pick-up lockers at certain Whole Foods locations and folding the chain's private labels like 365 Everyday Value into the site's own growing collection.

Whole Foods has faced legal action in the past accusing the chain of overcharging customers. The company had also been struggling for months before the merger was announced as other stores offered its organic fresh fare for cheaper.

The announcement comes the day after the Federal Trade Commission gave the deal the green light, and Whole Foods shareholders voted to formally approve it.

Amazon first announced it would acquire the chain early this summer, sending grocery and other retail stocks plummeting as investors fretted over the online shopping behemoth's potential to upend the space. Shares of supermarket giants like Kroger and Costco again fell upon Thursday's announcement that the deal is set to close.

KR Price data by YCharts