I found series 2 at the Toys R Us in Gainesville, Florida. An employee was hanging them on pegs as I walked up. I asked if they could be purchased yet, as I'd heard others had been turned away at the register, but he assured me any error would be overridden by the cashier. He was right! They were tagged as not being sold until 5/1, and the cashier had the manager come do an override.
Interestingly enough, Edna Krabappel was not in the batch the employee put out. I felt every bag in search of her, and I'm a pro at this - she was not included. I hope this doesn't mean she's rare, as she's the figure I want most out of this bunch. I settled for Patty, Selma, and Groundskeeper Willie.