Nearly as soon as the news broke that Pope Francis was visiting Philadelphia next September as part of the World Meeting of Families Conference, reports of sold-out hotels within a 10-mile radius of Philly followed en masse. That’s what happens when two million travelers are expected in a city with 11,500 hotel rooms.

Here’s a solution for any travelers planning a Philly visit, at least a temporary one: Book on AirBNB ASAP. Like right after you finish reading that sentence.

On AirBNB as of Tuesday afternoon, there were around 850 places available in Philadelphia to host two people for the weekend Pope Francis is  in town, Sept. 25-27. There were slightly more than 600 available for $150 per night or less.

To rent someone’s place on AirBNB, the host or hostess must confirm your request.Book now before these hosts and hostesses realize they could be making a helluva lot more than $150.

And if you rent out your place on AirBNB, you might want to make some adjustments to your asking price.