Is there a way to get ShieldPRO features for free?

Firstly, please review the all ShieldPRO pricing plans here. 

If you are iControlWP client, you can get ShieldPRO essentially "for free" when you use Shield Central inside iControlWP.

We turn on all ShieldPRO features automatically for Shield Central clients (i.e. inside iControlWP).

Please see our iControlWP subscription plans here.