A Powerball ticket worth $1 million was sold at a gas station in northwest Iowa. The Iowa lottery says the winning ticket from Saturday's drawing was purchased at a Casey's convenience store in Sheldon. The ticket matched the first five numbers but missed the Powerball number. It was one of five tickets nationwide to win $1 million in Saturday's drawing. No one won Saturday's $88 million jackpot, so the prize will increase to roughly $108 million for Wednesday's drawing.