Occasionally, you may wish to purchase books from a specific bookseller or from booksellers in a specific country. There are two advantages to this. First, you can reduce the cost of shipping by finding booksellers close to you or by ordering multiple items from the same store. Second, you can purchase one or more books from a bookseller with an area of specialty that interests you. You can also use this feature to find bookstores in your area.

If you chose to search bookstores by location, you will see a new screen with further search options.

Once you've performed a search for a book, you can search through a specific bookseller's inventory from the results list.
From
the Search Results screen, find a book offered by a seller that you are
interested in purchasing from. Click
"[More Books from this Seller]"
located at the bottom of each book listing.

You
will see the Advanced Search screen but in this case, only
the specified seller's inventory will be searched. (You
will see a note at the top of the search form that reads "Searching
the inventory of...")
If
you click "[Bookseller & Payment
Information]" on the Search Results screen and then click
[Browse this Seller's Books],
if the seller organizes their listings by catalogs, you will be able to
"browse" their books by catalogs (subject) headings. Clicking
on the catalog name will bring up the seller's books that are associated
with that catalog.

See also:
Asking the Bookseller a Question