If you want a reliable source for spreads, Vegas Insider is your best bet:
As I mentioned, it is 4.5 at Atlantis, Circa, Coasts, Harrah's, and Matchbook. It's 5 at CG Tech, DraftKings, Golden Nugget, Play MGM, Southpoint, TI, Westgate, William Hill, and the Wynn. It's 5.5 at Stations and Mirage. It's 6 at the Peppermill, and has been since June 16th.