All of the poker trackers (PokerTracker, Elephant, Holdem manager) I believe have trial periods.
As an idea, maybe you can use these trial periods to work with the software and see how they work for you. Hopefully by the time the trials are up, you'll have made enough money playing poker, and have enough experience with each product, to know which one you like the best. Then you can purchase that one.
Also note that you can get elephant for free (but it will take some time) by collecting 2000 strategy points.
It may be possible to use the trial and clear points while you're using it, so by the time the trial is up, you'll have a license. (I don't know how long the trial is, I've never downloaded elephant.. but when I decide to, I do have my license points already).
just some random thoughts. ♦