Michael Schoch, Answers questions on Noodle
Go! Academy does offer a program specifically for 3 year-olds; you can read a little more about it on the school's website. Go! Academy doesn't publish its tuition information so I recommend calling directly at 972-878-4622 to get a specific cost estimate.
You can find other preschool programs near you with the Noodle school locator. If you're interested in free school's, you may also want to visit the Ennis Independent School District's Head Start page. Head Start programs are publicly funded and free to families who meet income-eligibility requirements.
I hope that helps! Good luck!