For those who don’t know: there is a free Apache licensed version of IntelliJ.
It’s usable for Java/scala development, but lacks features. Feature comparison at https://www.jetbrains.com/idea/features/editions_comparison_....
And “whatever it is” is $499 for the first, $399 for the second, and $299 for later years (https://www.jetbrains.com/idea/buy/#commercial?billing=yearl...)