I think Top Tropicals ships plants to all 50 states. I saw some nice smaller 3 gal plants of that variety there just before Christmas.They looked like 2016 grafted trees that I wouldn't expect to be root bound. They list Mango trees and some other plants as ship-able to California, which has very tight restrictions.
I would guess they ship Mango trees to Texas but call them to find out for sure. Not sure what type of cold temperatures they would go through in shipment this time of year,that might be a risk....