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Online resource to get expense ratios for mutual funds, index funds & ETFs? 
If you want the answer from the horse's mouth, go to the website of the ETF or mutual find, and the expense ratio will be listed there, both on the "Important Information" part of the front page, as well as in the .pdf file that you click on to download the Prospectus.  Oh wait, you don't want to go the fund's website at all, just to a query site where you type in something like VFINX. hit SEARCH, and out pops the expense ratio for the Vanguard S&P 500 Index Fund? Well, have you considered MorningStar?