I found some links that already have useful information or have the promise to provide useful information in the future.
Yahoo! is getting a good list of local businesses at http://local.yahoo.com/. Just type in what you need, our zip code, which is 78572, and submit. Be sure to narrow your search to 10 miles. Mission is not a big town, so it 10 miles is sufficient.
I will be visiting local businesses and posting reviews on Yahoo! for everybody to read.