I love the one Jersey posted and have been coveting it, but I’ve never been able to find it in a store and to order it would be like $7 shipping for a $2 item. When I finally ordrered more hay from Drs F&S, they didn’t carry it anymore.
I have some super cheap-o cat ones that I got at the pet store – they say “Go Cat Go” on them or something and are purple and green. They’re just hollow plastic balls with a hole. Large pellets don’t fall out immediately and it’s a decent size for dried fruit. It’s not adjustable so the small stuff falls right out, but the bunnies like it when it’s easy anyway.
I also have a Teach ‘n’ Treat that they looove. It doesn’t move around, but it offers lots of ways to hide treats.
In my house they’re not good toys to keep the bunnies occupied – within 15sec somebody has pushed their ball under the coffee table or tv, and then they just stare at me until I get it back (or try to steal a treat ball from the other bunny).