I need to get myself some new buckets and found these at a great price! They are stainless steel flat sided and start under $5. I fill them up with small foot toys, wads of paper (some with treats in them), some lose treats and anything else I can find to put in it. This birds have a ball pulling out stuff and tossing it around and they get so excited when they find a treat!
https://www.petedge.com/zpetedgemain...c-locale=en_US