Flex Builder is now free for not only students and educators but also for those who are currently unemployed! If you fall into this category - my sympathies - but hopefully by learning Flex you can get a job again soon. And since the Flex job market is super hot, getting a new Flex job shouldn’t be too hard. :)
All you need to do is go to freeriatools.adobe.com and (honestly) fill out the information. I hope this helps get you on your feet again!