Where can I get inexpensive health insurance as an individual?

I need for 4 months until I start job. I am age 21 and healthy
--------------------
If you only need it for four months you'll need to get a short term medical policy. You can contact any local independent agent to find one. They are designed for people waiting for insurance. They are inexpensive and don't have all the bells and whistles but they'll cover you for catastrophic accidents or illnesses. However, they won't cover any pre-existing conditions.
Source