How can I promote my business cheap and only in the Houston area?

You can promote it through Craigslist. You could also make posters for your business that you could put up at local stores. You could try and make a business website, and make your own commercials on YouTube and put a link to the website. Also you could advertise on your car/truck, and everyone in town would see it. If all else fails find a local athlete who has talent, offer to sponsor them for their sport, and they can help promote your products. If you try any or all of these, you should get more business then you currently have.