Sacha Fournier, who recently debuted an interactive map that tracks McDonald’s Big Mac prices throughout the United States in real time, has followed up on the viral success of “McCheapest” with a map that tracks something else we’ve all been keeping an eye on: the steep price of a dozen eggs at the grocery store. The new map, which is housed at eggspensive.net, looks just like McCheapest, but it focuses on egg prices at Walmart locations across the United States and is updated hourly. “I built a custom scraper that essentially ‘browses’ the Walmart website and views the eggs category for each store,” Fournier told The Takeout. “Prices are extracted, and then I have some code that cleans and triple checks the data for any anomalies.”