A.C.
So, interesting, a co-worker asked me about this just today.
The three separate vaccinations may be hard to find and your insurance may not cover the full cost.
You have a couple of options:
1) Ask your doctor to write a prescription and then call around to larger hospital pharmacies.
2) Contact a doctor that specializes in travel medicine...they have many singular vaccinations that are usually only in combination for standard immunizations.
3) University hospitals may have them in stock , try UTMB in Galveston.
Krenie Stowe specializes in alternative medicine in Houston. I don't believe that she accepts insurance, but she will actually come to your home or you can go to her clinic (near The Woodlands).
Good luck!