Easily make your own cat enclosure from PVC pipe and connectors
Aivituvin Outdoor Cat Enclosure for Sale,Large Outside Cat Enclosures
Cat/Pet Enclosure Kit - 1m x 1m x 1m PVC pipe and connectors Hammock optional) | eBay
Amazon.com : Aivituvin Cat Catio Outdoor Cat House Wooden Large Enclosure with Run on Wheels 70.9" Upgraded Version Catio with Reinforcement Strip,Waterproof Roof (Grey) : Pet Supplies
Amazon.com : CATLAND Yellow Outdoor Cat Enclosures - Large Catio for Cats Cage with Removable PVC Sun Shade Cloth Roof - Wood & Wire Mesh Catio Outdoor Cat Enclosure with Play Area-Mini