If you go to the Sea World (SW) website and enter the promo code "playanddine", the 1-day adult ticket with all-day food is
$98, after tax. Still have to pay for parking, $15/day/car. (Aquatica is $12/day/car.)
The "Fun Card" is the same price online (
$98 incl tax) but instead of food, it allows unlimited admission to SW through 2013.
I don't see an After-3PM option for SW. With their new Penquin attraction, they may not be offering it.
A single day, advance purchase, regular ticket online to SW through their website is ~$87 after tax.

The 1-Day ticket to SW is just
~$80 incl tax, through
UndercoverTourist (very reputable), with free shipping if you allow at least 21 days advance time for ground shipping.
An
annual pass (AP) to

SW (365 days, not just 2013), purchased online at SW, is
$159 incl tax. This includes
free parking, $10 off friends/family regular 1-day tickets at the gate (up to 6 per visit, accompanied by AP holder) and
10% off food/merchandise in the park. For a limited time, AP holders may get $20 off friend tickets online.
Combined,
Annual Pass to both SW Orlando

and Aquatica

(365 days), purchased online, is
$191 incl tax, provides
free parking at both parks, $10 off friends/family 1-day tix at
both parks, and 10% off food/stuff at
both parks.
We (DH & I) plan to be in the area toward the end of this year with 4 more adults, in 2 cars. We're considering getting the APs for ourselves (free parking for each car) and either the discounted 1-day tix or the play-and-dine tix for the rest of the group to visit SW. Then we'll use the discounts on this trip and we two can return to either SW or both parks when we're back in Orlando on our own during a warmer time of year.

Aquatica does have an
After-2PM option online which does
not include SW, for unlimited visits through the end of 2013. It's
$59 incl tax, plus you pay the daily parking $12/car.
A
14-day, unlimited pass to
both 
SW and

Aquatica, purchased in advance, is $127 incl tax through the SW/Aq website and just
$116 incl tax through UndercoverTourist. This pass also includes
1 hour early entry on
Mondays and Thursdays at Sea World through Sept 2, 2013. Daily parking is extra (SW $15/Aq $12 - visit both in same day with one parking fee). IMHO, for a warm weather visit, the $116, 14-day unlimited passes to both SW & Aquatica (14-day) are hard to beat. HTH!