Maureen, a Google check shows that Niagra starch is carried by Walgreen's drug stores, and there is a Walgreen's about 1-1/2 mile from the convention center, and several others downtown. I'm not very familiar with Houston, but I'm sure that you could get a cab if that is too far for you to walk, and I would call the store to make sure they have it before going. I also noticed that Niagra comes in the original formula and a heavy version, but they are aerosols, which you probably wouldn't be able to take home on the plane. I see that there is now a non-aerosol Niagra starch. You might want to bring a large plastic bag to try to take that home with you in case you can find that version. Good luck!