With no winner matching all six numbers on Wednesday, the jackpot for Saturday is now an estimated $1.5 billion, which would hold a cash value of $745.9 million, Powerball said.There was also no jackpot winner Monday -- though more than 5.4 million tickets totaling $59.5 million in cash prizes won on Halloween, Powerball said in a press release, including 10 tickets that matched all five white balls for a $1 million prize.If there's a winner Saturday night, the jackpot would be the second-largest jackpot in Powerball history and third-largest in U.S. lottery history, Powerball said.The largest prize in Powerball history, sold in January 2016, was $1.586 billion and was shared by three winners in California, Florida and Tennessee.How late can you buy Powerball ticketsAccording to Powerball, "sales cut-off times vary by selling jurisdiction."