Do you have a family, or anyone who depends on your income for their support? If not, you don't need life insurance. If you do, then you need a total of about 8 to 10 times your annual income. That amount will "replace" your income for a good number of years giving your family the ability to continue with their lives with plenty of time to adjust their financial plans to life without you.
Here's an independent (i.e. sells insurance from multiple companies) broker from whom you can get quotes online. Even if you don't buy from them, their quotes are a good for comparing to other quotes that you might get.
http://zanderins.com/