You will pass Sams Club as you enter the Island on the way to HHI. It is on the right in the shopping center with the CVS, Pizza Hut and Bi-Lo (grocery store)
I would say it is about 3-5 miles from the resort.
Loved they had a Sams so close. I purchased all our beach gear and groceries there. Smaller items from Bi-Lo.
The Sams locator will give you the proper address, but we rode bikes that far 1 afternoon, because the kennel is in the same area and I'm no Lance Armstrong! LOL!