There is a special TradeStation data offer on this month only, for new customers only, that is even better.
It is better than the generally advertised offer and is suitable even for low-activity customers.
Maybe it would work to call them up and ask about this month's unpublished "Free Data" offer.
I just opened an account under this offer.
It is even better than I imply above - I left out the best part of it - but I do not want to be too explicit in public since they do not want that.