Here's a great deal I came across, thanks to Atlanta on the Cheap.
Me and Mommy ticket deal at the Georgia Aquarium
For only $25 you can get Aquarium admission for one adult (usually costs $26.00), FREE admission for up to 4 children age 5 and under (tickets for age 3+ usually cost $19.50 each!) and a FREE parking pass ($10 value). This offer is valid Monday-Friday, now through November 19, 2009, and can only be purchased online.