Check out the SnoozePal and the ‘Cat Hammock With Wood Stand’ (pictured) at CatAbove’s . They also sell so you don’t have to worry if your cat turns the hammocks into a scratching pad.
The hammock itself is the only part you may have to replace at some point, but it too is very sturdy and two-sided to keep kitty cool in summer and warm in the winter. All hammocks are machine washable and you have your choice of three color combinations for the hammock. The Cat Hammock With Wood Stand is $79.