A quick Googles suggests:
Asahiya Bookstores
Bunka Do
340 East First St.
Los Angeles, CA 90012
Phone: (213) 625-8673
About 1 block from the Japanese-American National Museum in the Little Tokyo area of downtown Los Angeles. Carries a large selection of paper and a small selection of books, including books by Fuse and Brill.
Dick Blick
Kinokuniya Bookstore
123 Onizuka Street, Suite 205
Los Angeles, CA 90012
Phone: (213) 687-4480
The store is located on the second level of an outdoor mall, Weller Court, that is attached to the New Otani Hotel, near Los Angeles City Hall (about 4 flocks from the Civic Center Subway station). Japanese bookstore with imported books, prepackaged paper and washi. There are other stores in the area that carry origami books and supplies.
Legion Paper
6333 Chalet Drive
Los Angeles, CA 90040
Phone (800) 727-3716
Fax (562) 927-6100
International Phone (562) 928-5600
E-mail:
info@legionpaper.com
Wholesaler of fine art paper. Check the website for local shops that retail papers imported by Legion.