This is an update with the solution of my issue.

The market data from IB needed to trade Z13 are indeed not as costly as I supposed. There is a 1,50 USD/Mnt for Arca(SPY) feed. For OPRA Options feed another 1,50 USD/Month, applied only by low activity. With these two subscriptions, it is all set for Z13 - live.

I do not need to experiment with the "preload" flag and Yahoo Options data anymore.