I got Jerry's gym from a place in QLD called The Original Eumundi Birdhouse Co. They make these bird house and lots of other things from recycled wood which is all bird safe

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Their website is
http://www.oebco.com.au/
It's quite heavy and reasonably priced from what I've seen of other bird gyms. Jerry loves, I found him hanging upside down from ladder the other day.
He's turning into quite the little deviant, likes to steal food and get into things that he shouldn't
