The Texas Travel Industry Association currently has an option to purchase amusement park discount tickets!
Here is a list of what they are offering:
Six Flags Over Texas (Arlington) $23.50 adult or child
Six Flags Fiesta Texas (San Antonio)$27 adult or child
Space Center Houston $10 adult or child
Splashtown Houston $23 adult or child
Natural Bridge Caverns (New Braunfels)$10.50 adult / $7.00 child
Hurricane Harbor (Arlington) $15.00 adult or child