Quote from UDon'tKnowMe:
How much are you willing to pay for it? There are a bunch of feeds out there, but you get what you pay for.
Quote from journeyman:
1) TWS does NOT have a tick datastream - IB feed it an aggregated sub-second stream
2) I assume you are wanting a real time tick data stream?
3) if 2) is yes then the most important issue is what application you feed the stream to, which you don't mention at all
Quote from Greg:
Just ran across OpenTick. Any thoughts about it. BTW it is a pay service now. I take it that it was a free service before.