This was on sale when I bought it; I think it was about $54 total.  At first I thought it was flimsy (the boards are thinner than the ones I see at Petco), however it turns out it's perfect (it's not as heavy, very easy to move around, yet sturdy enough for my 13# cat).  There is enough space in the enclosed section that my cat can eat in there without being bothered by my dog.  My cat knew immediately what the rope covered columns were for (scratching), and he loves to sleep or sit and gaze out the window on the upper 2 sections.  Great purchase!!  Oh, and very easy to assemble.