I take it from the name it may not be cheap either if being shipped from Phoenix.
I have in the past bought cat trees from PetPlanet who often have fairly substantial discounts on cat furniture, but sometimes its down to timing and what they have on offer.
Zooplus sometimes have good offers, I got an extra tall scratching post for less than half price just before xmas. The cocopalm one is really good quality - the previous one having lasted over 2yrs which is excellent when compared to the PetsatHome ones which only tend to last a few months.