I'm sorry this won't help with an August reservation, but thanks to another person on the boards, they had this discount info:
It has to do with a "Radio Promotion button" that can be found on the homepage of the Discovery Cove website. WLOQ is a Jazz radio station in the Orlando area that was involved in a promo (I can't find it on their website however)
You can use the code: WLOQ
Your "WLOQ Promotional" package includes:
(1) The Dolphin swim package ($199 plus tax) includes:
Dolphin swim experience
Unlimited access to all swim and snorkeling areas and the aviary
A freshly prepared meal
Use of a mask, snorkel, swim vest/wetsuit, fins, towel, locker, beach chairs, etc.
Self-parking
(2) A non-dolphin swim package ($99 plus tax) is available for guests who do not wish to participate in a dolphin swim experience, but would like to enjoy the regular activities and amenities.
*Promotional packages do not include the seven-day SeaWorld Orlando pass. To receive the promotional discount, your Discovery Cove reservation and visit date must be completed between April 21 and June 15, 2003. Regular admission prices are $229 plus tax for the dolphin swim package, and $129 plus tax for the non-dolphin swim package. A dolphin swim reservation must be made in order to book a non-dolphin swim package. Regular admission rates will apply if visit date is booked after June 15, 2003. Availability is limited and prices are subject to change.
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I tried this today and they were kind enough to extend this rate to my existing reservation.
Hope this helps someone!
Cheers.