It is no secret that these times are not the best we’ve had in the past 9 years, and that some of us have lost jobs. Thus, we (Adobe Evangelists) thought the least we could do is to lend a hand and help people in this situation to learn Flex. This way they can improve their chances of finding a job, and, who knows, maybe find a better paying one.
As a result we put together this site: https://freeriatools.adobe.com/learnflex/, where you can get Flex Builder 3 Professional (if you are unemployed and you will not use the product for commercial purposes).
All the best!