Best Source for tick data

[5flags]

I would like to back test some strategies for trading and was wondering what the best source would be for historical tick data. I would guess any more than 3 months would be of more limited value right now, but I'm unsure if this is even available. Any suggestions?

5flags

[tagada]

You can take a look at this thread:
https://bitcointalk.org/index.php?topic=196834.0

Or you can use a trial version of Sierrachart to download and export its historical tick data into csv yourself...