Google announced in its blog that collaborates with U.S. Department for Health and Human Services (HHS) and American Lung Association to offer this flu shot finder for U.S. at www.google.com/flushot. Just go to the webpage and enter your city or zip code, it will show the locations that offer seasonal flu shot, H1N1 flu shot or both shots. Here's the map around Monterey Park, CA area.
The locator provides location, phone number, data, time, cost (some of them are free) and the availability of the vaccine. The same flu shot locator will be available on HHS's www.flu.gov and American Lung Association's http://www.flucliniclocator.org/.
Please note that currently the locator only has data from 20 states, but they are adding information from chain pharmacies and other providers in all 50 states. Of course you should call the providers beforehand to find out about more details about the two vaccines.
If you didn't know yet, Google also release flu trends information for 20 countries they gather through people's search term here: http://www.google.org/flutrends/. If you want to know more about how they gather the information, they explains it here: http://www.google.org/flutrends/about/how.html.
Take extra care.