I'm arriving in Las Vegas on Saturday night, staying for the night, and then driving to Page on Sunday. I'll be staying in Page from Sunday night onwards, and visiting the various attractions near Page starting Monday, such as the Vermilion Cliffs and the Grand Canyon (North Rim), which are covered by the America the Beautiful Pass.
I would like to purchase the pass. There is this site that tells me where the pass can be bought (https://store.usgs.gov/s3fs-public/PassIssuanceList.pdf), but it appears that many of them do not open on Sunday (if there are any, I would be able to to drop by any of them on the drive from Las Vegas to Page). It furthermore seems that Page doesn't have an office or nearby National Recreation Area (NRA) site or office to purchase the pass. While the list contains the Grand Canyon, it isn't clear whether it means only the (more touristy) South Rim, or the North Rim as well. There's also Glen Canyon, but that's a huge area and it doesn't say which entrances I can use to purchase the pass either.
Where is the most convenient place for me to buy the pass?
Note: I'm not visiting any NRA sites on Sunday.