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Market data for options

Looking for recommendations on places to get market data for options. I'm looking at NYSE and NASDAQ only. My current solution is my broker, Tradeking. I can request realtime data for 700 option ...
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run time error 424 in IB TWS Excel DDE API; failed to add combo orders

I'm using an Excel DDE to connect to Interactive Brokers TWS via their API 9.72 sample, excel 2013. When I tried to create a combo order, the rum error code 424 said "object required". It seems that ...