There's always eBay, spread the word you're looking.
Also go to your local fridge repairers and secondhand shops. You never know what you find. Ask local van repairers what they know, or for recommendations of where to go next.
I'm wary of secondhand fridges, but you may be lucky to find a good one for the right price. They're very costly brand new.
Good luck with that. Cheers Granny