Hi Patricia,
Thanks for coming to the Disney Parks Moms Panel with your question. How exciting that you are heading to Walt Disney World so soon!
To my knowledge, there is no Disney Vacation Club discount on the Rapid Refill mugs. When I am looking to find the currently available discounts for Disney Vacation Club members, I log onto the
Disney Vacation Club Member Website. Once I log in, I go to the tab for "Membership Extras" and scroll down to "Perks & Discounts." From this page, you can download Portable Perks, which lists currently available discounts for Disney Vacation Club members. These perks and discounts are subject to change, so I always carry my Disney Vacation Club Member card with me at Walt Disney World and ask whenever I make a purchase if there is a discount for Disney Vacation Club members.
I hope that this answer is helpful for you, Patricia! Have a great time planning your vacation, and please do not hesitate to ask if you have any further questions.