Hi.

I'm focusing my trading right now on the ETFs, mostly (these days) XLF, SPY and QQQQ and the double short variants.

I have a TDAmeritrade Apex account (which I don't trade in) and a TDAmeritrade iZone account.

My main career is software development, and I want to write some backtesting software for my day trading strategies. Can anyone point me to some free (for TDA users anyway) or low cost providers of historic 1 minute data on the major ETFs?

Thanks!