You are going to have to purchase it like everyone else.
If your looking to do a short term project, or want to learn this is an option.

http://www.compilespot.com/

It's an online compiler for PICBasic Pro and you can pay monthly.

1 month - $25
3 months - $65
6 months - $115
12 months - $200

Other than that you're looking at $249.95.