Our customers like the Realtimetraders news that is included in the basic service of our DTN.IQ, IQFeed and ProphetX Active Trader services, but many also buy theflyonthewall or Midnight Trader for pre and post market information. All of these services are available for purchase direct from the providers (you don't need a DTN subscription) websites and cost in the range of $20-$30 per month.
Here is the description we have for Midnight Trader:
Only MidnightTrader provides real-time extended-hours coverage of stocks likely to move in the following regular session. With MidnightTrader News you'll find opportunities and be better prepared for regular session trading by staying ahead of Wall Street with live pre-market stock trading news from 6:45 to 10 am EST and late breaking after-hours coverage from 3:30 to 8 pm EST. MidnightTrader provides traders with an edge on regular session and extended-hours trading, averaging over 100 stories per day.
And for theflyonthewall.com:
Theflyonthewall.com's live news feed contains the same information circulating around Wall Street trading desks as it happens. It will help explain why specific stocks are moving and keep you in the loop of important, breaking news. If you are a trader, money manager or active investor, you can't afford to be out of this loop.