I have gathered some links that will lead you to information about receiving discounted pricing on admission into Six Flags Parks. I don't have links for all the parks, but I will continue looking. When you go to the link it's pretty self explanatory of what you have to do. In some cases these are employee or student discounts, but the process is done completely online so.......
Anyhow some links contain discounts for single day, meal vouchers, parking vouchers, and season passes. Others don't offer as much.
Note there is a $5 processing fee per transaction, not per ticket. So for me buying 5 tickets the processing fee is $5.
Six Flags New England
Six Flags Over Georgia
Verified 27.50 Updated
Six Flags Over Georgia White Water
Six Flags over St Louis
Six Flags Great Adventure
Six Flags Over Texas
Verified 22.99 Updated
Six Flags Hurricane Harbor – Arlington
Six Flags Great America
Six Flags Elitch Gardens
Six Flags Hurricane Harbor - New Jersey
Six Flags America - 23.99
un - JHWLE1AM
pw - SixFlags5
Six Flags Discovery Kingdom
Six Flags Magic Mountain
Verified 25.99 Adult 17.50 Child
Six Flags Hurricane Harbor - LA
Verified 19.99 Adult 15.00 Child