Hi Liz,
I work in Retail Marketing in Australia, and we work with one of our tenants (Photography store/lab) to provide our Santa Photography.
They have staff who take the pictures, and everything printed in-store, which provides a high quality finish. Generally, it's same-day if it completed in the morning session, or next day from the afternoon.
This may also be something you want to think about, even though it might scare people initially. Plus the Mall will be happy that customers have to visit the centre/mall to pick up the prints! Heck, they might even spend something! It's all about repeat visitation.
However, the above option might not be available to you and immediate print may be your only option. Also, in relation to snap happy parents, just politely advise them the mall owners do not allow photography onsite without permission. The customers won't ask and the management company wouldn't give permission.
Just my 2c working in the industry!
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