There's a program at the University of North Texas Health Science Center (UNTHSC) that's a 1-yr M.S. program in Medical Sciences. Basically an SMP course that shares a ton of classes with first year students at TCOM...even structural anatomy in the Spring so that'll be cool. Unfortunately we started in June...but you may want to do this next year if you don't get in this year. Pretty good acceptance rate (MD and DO schools about 75% [100% if the Master's GPA is 3.5 and >] ) and total tuition is about 7000 for the whole year.
Other than this--sorry, I don't know about anything else here in TX.