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Data source for historical intra-day bid/ask price data for stocks? 
FreeStockCharts.com keeps some intra-day trading history.  You have to create an account to look up individual stocks.  Once you create a free account you can get intra-day trading history for the last month (Hourly for past month, 15 minutes for past week, 1 minute for past day).  Going back past one month and it only keeps daily close history. Here is Family Dollary's (FDO) hourly intra-day chart for the past month: