If the Internet is to be believed they're not actually more expensive than an F/A-18, and as far as military aircraft go.. not the most expensive. But a ~$150M accident is nothing to sneeze at.

Perhaps the internet price excludes the EW payload? Seems like a plane with a load of electronics gear and transmitters/antennas would cost more than the same plane sans that stuff?

I do not know the specifics, but I think most of the EW gear sits on pods attached to the pilons, not inside the actual plane. The only difference that I know of compared to a regular F18 is that it requires two crew members to operate.

Yes, the EW gear is attached to the hardpoints. You can see in the video that it has not been installed for the airshow.