A local has made a plapen out of 4 pcs of plastic pegboard. The boards are held together with computer ties. All you have to do is cut the computer ties from one side and it collapses down. Put a pc a linoleum under it for messes. Estimated cost $60. I aksed about ferrets climbing out and he said no. we use a popular home built ferret playpen that stands 2 ft high and a few of the tinier girls and fiestier males can jump out with no effort. KG [Posted in FML issue 4290]