Since the latté returned to Starbucks’ menu in early September, it’s been so hugely popular that branches all over the country have reported they’re out of the signature pumpkin syrup they use to make the drink, writes The Wall Street Journal. It’s become such a big deal that people who a lucky enough to get a bottle of the pumpkin syrup are taking their goods to eBay, where syrup containers are selling between $40 and $50.