mikeeve, what it actually says on the Wolfman's website is that you can download the screensaver for free, and it's free of virus. Not to be confused with the fact that the actual screensaver is free, because non of his are free, as far as I know of. However, consider the quality of what is offered there.
That being said, I believe if one were of a mind to pay for a screensaver, then Wolfman's are the cream of the crop. And you did start the thread by saying that you wouldn't mind paying a little for a good one, yes? :-)
So, at this point I see a couple of options for you. First, you could consider getting the Wolfman screensaver that you really like the most, and wait to install it until about the 10th of Dec, and that way it lasts until Xmas without any payment needed.
Second, you could settle for a freeware screensaver, that is not quite the quality of Wolfman's work, but it also does not require payment, and you run it when you wish.
Enjoy the journey! :-)