Are you looking to serve direct sold ads using Flurry? If yes, you can create an 'Advertisers' campaign under the Publishers tab, and set the value in the price field as $0.01. There is a bug in the system which doesn't allow the value to be $0.00. However, since this value is only for your self-reporting purpose, it wouldn't affect ad serving.
For any further queries, please write to support@flurry.com.
(Full disclosure: I work in the Support team at Flurry)