I am worried about this; I cannot afford to fly to Dallas [+car rental and + hotel] due to the fact that I am trying to save as much money as I can for my eventual move, but remain extremely interested in SMU... I hope that they do not interpret my inability to visit them as disinterest - any recommendations?
I think that you'll be okay. Of the 4 WLs that I was able to find my way off, I only visited one school (and I am not even attending that school).
Just be sure to follow-up with a solid LOCI. Try to link characteristics / qualities that you have to something unique / personal about SMU (it could be clinics, a focus in a certain subject matter, etc) and if you truly mean it, write and let them know that you will attend if admitted.