It's hard to shed a tear for a billionaire like Elon Musk, whose wealth has grown dramatically amid the pandemic while millions of Americans are struggling to survive. But it's not all sunshine and butterflies in Musk's world right now (at least by some measures). A new report from iSeeCars reveals that car sales have decreased dramatically amid COVID-19 thanks to social-distancing measures. And some car models have tanked more than others. Which brings us back to Musk, whose Tesla Model 3 tops the list of car models whose sales are declining most significantly amid the pandemic. Based on data from more than 1.8 million used cars for sale, here's a ranking of the 15 models that saw the biggest sales slowdown between February and March of this year — offering car buyers the potential to negotiate a better deal as dealers look to move them off the lot.