A group of my neighbors spoke with several residents in an unauthorized encampment that setup near I-5. We learned that a few of them were from Houston, TX. They had been given one-way tickets, paid for by the State of Texas, to one of any number of cities. They signed forms that said they promised not to return to Texas, otherwise they would be arrested.
A recent local study here in Seattle found that a significant percentage (maybe 30%) of our homeless are from outside the state of Washington.
Google "homeless bus tickets" and a city name.
Though the article makes it sound like expensive cities come out ahead with the vast majority of people being sent to lower cost destinations.