Here are the current prices on preorders:
Deluxes: 31.99 (28% increase from MSRP)
Commanders 119.99 (33% increase from MSRP)
Titan Star Optimus Prime 209.99 (40% increase from MSRP)
At the moment of writing, Entertainment Earth still has the 10% prices increase as opposed to the full 30% while Hasbro Pulse has all their preorders as unavailable.
Also, it is important to note that the 30% tariffs only apply to businesses. Individuals ordering from China now have an additional tax rate of 54% for imports (with a max of $100)