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I need 7 dte qqq or ndx options IV measured at or close friday closes. this is not high granulity so I am looking for free options or cheap options. I need last 10 years of data. 520 weeks and some percentages away from atm are good extras. +1 +2 +3% oom calls and +1+2+3% oom puts together with atm iv makes 7 data points per week. what is reasonable price to pay for 520\*7=3640 data points or pulling them with api. advice is welcome