Welcome to planDisney, Heather! It's so exciting that you're off on a magical vacation this week.
Disney Genie+ service is one of my favorite vacation planning tools because it saves my family time in line so we can use that time to make more memories together. I'm happy to talk about how to purchase it and how the pricing might look when you make that transaction.
Disney Genie+ does have dynamic pricing, which means that the purchase price may differ from day to day. In my experience, I have never seen the price change throughout the day. It has been set at midnight and remains the same price through 7:00 am when
Lightning Lane selections begin. I also have not seen the price change throughout the rest of the day, since Disney Genie+ remains available for purchase after the Theme Parks open. Prices are subject to change, so this might not be the case in the future, but the price you see at midnight has historically been the same price that all guests will be paying throughout the day.
I hope this answers your question, Heather, and please let us know if there's anything else we can do to help you plan your magical vacation!
Jessica