[chimeracoder]

> Does anyone know of any true market data sources that are not delayed, free and open for commercial use?

Short answer: No

Long answer: It depends on what you mean by "true market data". This requires understanding a lot more about how the market and bidding process actually functions, but there really isn't a single canonical price at any point, and there are many ways to define what you're looking for, depending on what you're referring to - all of which are valid according to different assumptions.

Think of it as a special kind of eventually-consistent database. Depending on the consistency model, you can't ask what the value of x is right now, because there are multiple possible values that are all valid. It's only after they converge (which takes time) that a single, canonical value emerges.

This is one of the reasons that quotes are always delayed - it's possible to talk about what the price was at some point in the past, because those ways of defining the price dynamically have all essentially converged to the same value, but it's not possible to pinpoint a single price in the present.

To get all of the various sources of real-time data that can be considered the "current price" requires a lot of low-latency connections to various market players. That's not cheap, so there's nothing that's not delayed and free and available for commercial use.