Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is San Jose (39% of total searches to Silicon Valley). The next most popular destinations are Burlingame (36%) and Foster City (13%). Searches for hotels in Fremont (13%) are also popular.
KAYAK users have found double rooms in Silicon Valley for as cheap as $79 (San Jose) in the last 3 days. The average price is $351.