I just took a quick look at Cedar Park High School's attendance area as a search criteria. Only 10 homes available for sale under $275,000! Increase your budget to $500K and you'll add 11 - 21 total.
This of course is just one area. It is representative of many parts of the Austin area market. For more specific information on your specific neighborhood - along with guidance in making the best decisions for your situation and goals - give me a call, text, or email so we can talk.