Web based service with live view of S&P 500 component stocks performace?

[webmal]

I'm looking for a web based subscription service that has a live intraday trend indicator (graph) where I can view the performance of every S&P 500 component stocks at once. I'm not looking to use a broker with that service and I'm willing to spend $50 per month. Is there such a service?

Here's what I mean by live intraday trend indicator (graph): Yfrog - tstm20080215un3.gif

Thank you.