Whole Foods just got less expensive. From a report: On Monday, the day that Amazon's $13.7 billion acquisition of the grocer went through, prices on certain Whole Foods items immediately dropped. On Friday, Business Insider visited a Whole Foods location in the Gowanus neighborhood of Brooklyn, New York, and checked the prices on 15 items (including a few variations on similar items) mentioned by the companies. The total cost of the basket on Friday -- pre-acquisition -- was $97.76. On Monday, we returned to the Gowanus Whole Foods and checked back in on the same items. This time, the total cost of the 15 items was $75.85. That's a nearly 23% drop in the total cost. Whole Trade Banana: 30 cents (Price dropped to $0.49 a pound from $0.79). Lean Ground Beef: $2 (Price dropped to $4.99 a pound from $6.99). Local Grass-Fed 85% Lean Ground Beef: $4 (Price dropped to $6.99 a pound from $10.99). Four-pack of Organic Avocado: $0 (Price stayed at $6.99 for a pack of four). Hass Avocados: $1.01 (Price dropped to $1.49 each from $2.50) for instance.