Looking for Imbalance Data historical

Does anyone have a source for decently priced historical imbalance data? Need 5 years of NYSE, NASD, and ARCA from 2012 to 2017.
 
Never seen this data for less than $500/mo/exchange. NASD is borderline worthless by the way, due to the way their auctions work, imbalances are only tradable by HFT.
 
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