I use DTN's NxCore for US Level I real-time data (last sale + bid/ask updates). The feed is excellent, but costs $500 per month. Here is the link: http://www.

I use DTN's NxCore for US Level I real-time data (last sale + bid/ask updates). The feed is excellent, but costs $500 per month. Here is the link: http://www.dtnmarketaccess.com/ http://www.dtnmarketaccess.com/