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‘I’m not buying new stuff any more’: the young people getting into ‘degrowth’
(www.theguardian.com)
Discussions about degrowth and all sorts of related topics. This includes UBI, economic democracy, the economics of green technologies, enviromental legislation and many more intressting economic topics.
I feel like I could learn a lot from these people
Start at freecycle.org
There's also local Buy Nothing/Everything is Free groups which may be more active depending on where you are
Also freegle and as you say, results may vary.
My hack is sign up for affluent areas near you and be prepared to travel a lil more.