[jihoon796]

Agreed with Quandl being a good source for financial data. Their APIs are also quite well-maintained. Within Quandl, I've found Zack's to be a good resource.

I work with both Quandl and Zack's pretty frequently, let me know if you're interested in buying large amounts of data from Zack's, and I can perhaps get you a discount from the listed prices on the Quandl website.

[miscellaneous]

If I was interested in such a discount, how would I contact you? (Also, how much is a "large amount"?)