Cheap and would keep the ferrets occupied. Need to think where both end of the pipe go to though.
Small Pets DIY... Ferret ball pit made from plastic Easter eggs. I got 144 of them from oriental trading for $10 The eggs are also great for balls to roll around when you put beads or beans in them.
Ferret fun, What a great idea!
Marshall Pet Products Pop-N-Play Ferret Ball Pit Toy at PETCO... But it would be way cooler to make it yourself
Crochet Easter egg noise maker ferret toy @Scott Hulme Jerrell
So easy!! Make a cat tent out of a t-shirt and hanger!!
Inexpensive and Homemade Ferret Toys as Ferret Gifts for Christmas | The Ferret Zone More
DIY Ball Pit Playground - PetDIYs.com
DIY crinkle plastic ferret toy
Hmmm, maybe this is a good idea.