Where can you buy market data

Quote from ChrisMMM:

Opinions on the best place to purchase market data?

Thanks


What are you after specifically? Stocks, futures, forex etc? And in what format: tick, 1 min bars, daily? Only US markets or otherwise? I assume you're after historical data? How far back do you need it?
 
Quote from rickty:

What are you after specifically? Stocks, futures, forex etc? And in what format: tick, 1 min bars, daily? Only US markets or otherwise? I assume you're after historical data? How far back do you need it?

I am looking for Futures Historical Tick data (on major indices and/or FX) that will also include Bid price, bid volume size, ask price, ask volume size and open interest size on both bid and ask.
I want to perform statistical analysis, so I need a lot of observations. When I am refering to bid and ask volume size, I mean volume taken place in bid and ask, the same applies for the rest features that I am looking (price and open interest).
Any help is really appreciated.
 
Never used them, but I assume you can get that from OpenTick. I think they have data going back 20 years, not sure if its with the info you want.
 
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