I like Ka-bobs, you can buy it and add more wooden toys to them, and arrange them the way you want and then hang it in the cage, my chins have four in various locations. When the wood is gone I just replace it. Also mine like the Big Branch Bites. (You can get all these from Petco or Petsmart) My female also likes her stuffed animals. I buy her little cat toys and take all the tags, tails, whiskers (etc.) off before I give it to her. Her favorite thing to do is drag a stuffed toy all the way to the top of her cage (5') and drop it and watch it fall, then go back down and get it drag it back to the top and watch it fall. My male has no interest in stuffed toys except for to cuddle with them.
If you wanna save money paper towel rolls keep Hailey busy all day. She drags them up her cage and pushes them down. She also has a big fluffy towel that she likes to move and hide under. She loves her kaabobs and igloo and ledges too.
You can actually stuff hay in the toilet paper roll, it will make it more interesting and fun. I also cut them up into different sizes and hide them around the cage, sometimes I will break their hay blocks up and hide them too. Just like feeding time at the zoo. Gotta make things interesting and fun for the critters. LOL!