You can get test versions of almost every good program - I bought Adobe Creative Suite 2 Premium for about 700 dollars USD, but I upgraded from a previous version, otherwise it would have been 1200 dollars. Just Photoshop alone (not an upgrade) is 700 dollars, so unless you have a reason to buy it (I do because I'm a graphic designer in training) then I wouldn't suggest it.
Ouch! That's definitely a lot of money.
I'd like to point out though, since a lot of people here are students, that Adobe (and many other software vendors, such as Microsoft) has educational pricing for their software. This means you can purchase the full versions of these programs for a lot less with valid proof that you are a student. You can do this at a store that sells educational software, or straight from Adobe's site. Where I work we sell the boxed educational version of CS2 Suite for $379, for example, or just Photoshop for $279. Granted that's still not cheap, but if you do need/want the program it's a good way to save a lot of money. This applies to students in grades K - 12 and part time and full time college students. (Since I work at a college, I think we can only sell to college students, but the Adobe Academic Online Store says students in grades K - 12 are eligible.)
Additionally, if you are a college student, Adobe works with certain colleges and has licensing programs, where you can get the Suite for even cheaper, if you're willing to settle for no box and documentation in .pdf form. :wink: