The drink crops up on the Starbucks menu annually for a limited time, and this year there has been an unusual run on the pumpkin batch. Thanks in part to a frothy dose of buzz brewed up by the Seattle-based coffee giant before the beverage’s Sept. 4 debut, the craze has drained supplies at stores across the country.

Baristas are hitting the street, searching for stashes of the flavored sauce at other stores. Customers denied their fix—which costs about $4 for a small cup, or “tall” in Starbucks speak—are tweeting about their dismay.

“My world almost ended this morning when the local Starbucks told me they were out of Pumpkin Spice Latte,” tweeted Jason Sizemore, 38 years old, of Lexington, Ky.