How to Sell Photo downloads from Large Event

I’ve been searching for a good solution to see if there is an easier way. I have an event with approx. 400 photos I need to make available for sale by download. I know I can do this via Marketpress however it will take forever to enter all of the information. Is there a way to set up a gallery, load all of the photos and then automatically import all of the information into Marketpress? The price will be the same for all downloads and I expect that the average customer will select 3-7 photos for download on average. Is this possible with MP without having to create a product for each file? I sure hope so.