Where does MarketXLS draw stock quote information from? Also, will there be an extra charge for the Options data?
We have multiple data sources like Quandl, Quotemedia, Barchart, Intrinio, and so on for stocks. We also source data from stock exchanges. We have multiple pricing plans to suit your requirements, which can be found at https://marketxls.com/marketxls-pricing-one-plan-2-2/. Different stocks/options data are available in different plans.