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Is there such thing as a portable or fold up , indoor flight cage for small birds?

I want my budgies to be able to fly and exercise safely indoors without the worry of them crashing into walls ( which they have done a few times)
I was thinking of buying a fold up gazebo made of netting and use it as a flight pen. Would this be suitable? Is there such a thing as a fold up bird flight? Any ideas appreciated. PS I live in Australia.

If there was such a thing I would love to know!
Just make one yourself. If you use netting make sure it is taut so that the birds don't get tangled in it easily. The gazebo idea sounds pretty good, why didn't I think of that? And you could take the netting off and use it when the birds aren't using it. I think it's do-able.