The wort time of year is when the weather changes and thousands of people get flu and diseases like that. Though doctors and hospitals are at help but if you need to find a flu vaccine store around you, Google just the online tool up for you. Google Flu Shot finder asks you to give your location and straight away gives you option for stores, in case your location thingy doesnt work, search for it.
This tool is in collaboration with flu.gov and only works on US. There is also an interactive health map if you are interested to find the seasonal variation of flu and H1N1 virus. Make sure you know the tips on how to protect yourself from it.