Betting sites probably aren't a bad indicator, but I would have jumped on the chance of getting 3:1 on a Biden win. We knew for months that a red mirage was a likely scenario.
That said, it's way too close for comfort. I'm still not willing to dismiss 538 and the like because they predicted 80:20 flip and it may go the other way twice. I do think they should have done a better job communicating the level of uncertainty.

... This just in: https://twitter.com/realDonaldTrump/...04491612618752
New possible outcome: the election results don't matter and they're going to test Kavanaugh's proposed "Bush v. Gore precedent".