Flex just became much more accessible. If you’re a student, educator, or if you run a non-commercial, non-institutional website, you can now use Flex for free in a production environment. From Macromedia’s site:
This software license will enable individuals, including students, technology educators and individual developers to build and deploy Flex applications at no cost (except for a small shipping and handling fee). Participants also receive 1 license of Macromedia Flex Builder, the Macromedia IDE for Flex.
Find out more (including exactly who qualifies) by reading the Flex FAQ.