Hello, Marci!
There is not currently a one day option for Memory Maker. However, it still may be a good value for your family depending on how you spend your magical day.
If you purchase the Memory Maker at the advanced price, you would need to have at least a dozen download-worthy photos for you to see the financial benefits of the Memory Maker. If you are visiting several characters, have ride photos, and a family picture taken in front of Cinderella Castle - your photo ops can quickly add up!
However, if you do not plan on visiting many characters and tend to mostly ride rides and visit other attractions, the Memory Maker may not be the best investment for this specific visit. I would decide what my primary focus of the day would be and decide from there if this purchase would be wise.
Have a magical day, Marci!
~Rachel