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If you do not want to spend a lot of money I can recommend you Sierra Chart and CTS as data provider. Sierra offers a lot of volume indicators and CTS is an excelent data feed.
Sierra actually offers trade flow bars amongst other bid vs ask chart types. I haven't tested CTS data recently, but Rithmic is an even more economical route fwiw.
According to SC support, using Rithmic via Optimus offers 30+ days of b/a tick data.
Someone yesterday said Rithmic would be offering backfill as well, but there aren't any details at this point that i'm aware of (hoping its more then 1 day)
