If you are a member of Sam's Club or other membership type store, you might check with their Travel department. Sam's sells single day passes to Universal / IOA at a small discount, but then charges about $4.00 postage to mail them from their distribution center. The local stores do not sell the tickets to be picked up in person - I checked. If there are more than 2 or 3 in your party, and you have time to wait for the tickets to arrive, this might be an option.
www.hotelkingdom.com offers a discounted single day ticket if you book your hotel room through them.
Along with tickets to other parks, the AAA in my area sells only a single day pass to USF and multi day passes to IOA and USF. I'm not sure about other areas, but single day tickets to IOA are not available from the AAA where I live.
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