$700?!
Go to ebay and look for it there. Or look for an older version. Or better yet, look for an older version of Flash. Avoid the Academic/Student/Education versions, as you need a student code to activate them. They're cheaper for a reason, so don't get burned. :\
Look for Adobe Flash CS4, CS3, CS2, Macromedia Flash MX 2004, and/or Flash MX, which is what I got. I've got tips and tutorial links in my most recent news post in my profile. That'll get that watermark off your work, and watermarks kill your scores.