Have you tried dumpster diving?
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Gumtree used to be the king. Then it got took over and killed by ebay, in the mean time Facebook marketplace took over. Now is only full of scams and promoting adverts so impossible to easily sell used items any longer.
Gumtree is back in business but not many people still using it, which is a shame tbh as the new app is spot on
My parents got a fridge freezer via Facebook, from a house that was moving and didn't want to transport it. Might be worth looking at local marketplace groups.
My local recycling centre has a resale and reuse area, I think a lot of local councils have something like that set up.
Our local recycling centre goes by tonnage so technically anything that is taken from the sites is technically theft as the value of waste material offsets the running costs of the sites. Also fridges and freezers have to be degassed and are sent to a specialist facility to be decommissioned. The gasses are not CFCs any more but old freezers may be. The chemicals contained inside will be harmful to certain degrees. Staff at a recycling centre will probably be reluctant to give u one even though fridges will be one of the items that will probably cost the authority to get rid off. If there is CCTV on the site which there probably will be it could cost the site attendants their job. However if u wait outside the tip and intercept a freezer on the way there before it enters the site that is then a transaction between 2 private citizens.
You better read up on refrigeration chemicals before going ahead with your project.
Facebook has a lot of "buy nothing" style groups, there may be one near you.
On eBay you can set parameters like distance from you and then sort with lowest prices first.
Does Nextdoor or whatever it became still exist?