Frankie Valli is still a hot ticket in Sin City. Tickets to the Las Vegas production of the Four Seasons biotuner “Jersey Boys” go on sale Aug. 26 and will range from $65 to $135. Perfs start April 4, 2008.The multi-Tony-winning show will play at the Las Vegas Sands Corp.’s new Palazzo hotel, which is scheduled to open on Dec. 20. There’s no word yet on casting for the Vegas version, or on whether the company will use actors from either of the two “Jersey Boys” road tours already playing in San Francisco and Los Angeles. The Broadway production of the ‘60s pop musical has been running since November 2005 and still routinely clears $1 million a week in B.O. grosses at the August Wilson theater.