u shud really look into other skis, there are alot of other pow skis out there that are cheaper and will work for the park, im not sure how much the gunbs cost but im guessing in the 600-700 $ (U.S) range.  for that price you could go with the elizabeths, jp vs juliens, arvs, seth viscous, scratch bcs, and there are others, and ive heard better things about the skis ive listed than the PRs.
in all seriousness.. how can you go that high on a tree without pooping
-Bons