These art supply stores in your area should sell drawing materials such as pencils, paper, and erasers (like the 'kneaded' eraser, everybody's favorite in class!):
Monterey:
Aaron Brothers Art & Framing
498 Del Monte Center,
Monterey, CA
(831) 373-3436
Searle Art Supplies
639 Lighthouse Ave. Suite B
Lighthouse District - New Monterey
Monterey, CA 93940
(831) 373-0126