The address given for the actual gift shop and bookstore is:
George Washington Birthplace Gift Shop and Bookstore
1730 Popes Creek Road
Washington Birthplace, Virginia 22443
I guess the town is called Washington Birthplace. Hmm.
You can become a member of the George Washington Birthplace Association for $25.00 (or $35.00 for a Family membership), which gets you a 10% discount on items purchased either the online or on-site store.
Oh, I didn't think up "George Washington Slept Here--First!"
It's on a coffee mug.