Real Time Market Data, Best Source

Does anyone know where I can get real time 1 second (or close) data for specific stocks? i.e. a list that looks like below...

Time Price
9:30:01 2.01
9:30:02 2.00
9:30:03 1.98

etc.

I'm looking to develop a program that executes trades based on data comparisons.

Thanks,


Dean
 
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