The demand is there, but is the supply? Impossible Burger, one of the two first-movers in the space, is sold in 7,000 locations. It's expanding to Burger King with Impossible Whoppers, so that number could double by the end of the year. The company also plans to hit grocery store shelves this year as well. The only problem is that this massive increase in distribution has led to stock shortages. Similarly, Beyond Meat CEO Ethan Brown told Business Insider his company was in a similar jam in 2017 and 2018.