I know of a few of my local agencies that host ladies coming to town. And I have randomly found a few others, nationally, that bring women to town.
But is there a place on TER, or a better way of finding out about ladies coming in for a visit (other than them putting their own "ad" on a local board)??

Check your regional board for visitors coming to town.

try posting a message on the ISO boards.  There are a lot of great ladies who read the boards and will help out if they can... just request that they respond on the board and PM you on TER.
Just as example, post under heading:
Looking for visiting providers in Podunk
I recently posted a request on ISO board and got a couple of great leads.  Think you will find that this community will help when asked and if at all possible.

With the number of cities around, the local boards seem like the best place to post

But I'd love to hear some suggestions as to where else we could post to let gentlemen like yourself know we are heading your way....

Escort list sites like eros or cityvibe often have a "visiting" section.  Look there, check 'em out here, have fun!  In addition to checking your regional board here, of course!