Now’s your chance to buy Billie Joe Armstrong’s 1964 Chevrolet Impala. The Green Day singer is auctioning off the vintage gas guzzler on eBay as the band prepares to resume its world tour next month in Chicago. The tour was suspended in September after Armstrong flipped out at the iHeartRadio Music Festival in Vegas. When a teleprompter indicated the band had a minute to finish their set, he ranted, “I’m not [bleep]ing Justin Bieber, you mother[bleepers],” and smashed his guitar. He went into rehab two days later. The eBay listing notes Armstrong doesn’t want the car sitting in the lot at their Oakland, Calif., studio while they’re on tour, and adds, “Here is your chance to own a genuine rock-star car!” Bidding was up to $12,400 yesterday.