Buying a car at Auckland airport.
About 4 years ago, we went on a post retirement geriatric world trip, very much a DIY effort, and included two months round NZ. We could have rented a proper campervan/RV but this would have cost several thousand quid for two months. So, we rolled up at the Christchurch Backpackers' car market, and ended up buying a converted Toyota Previa(?) for £600 from a young German guy returning home. We checked it out and there were no suspicious graunches, smoke, steering or braking issues. I admit it was a leap of faith, but what the hell?
The van performed faultlessly throughout our stay. OK, it was a bit 'cosy' at times but it did the job, and we sold it two months later, for £400, at the Auckland Backpackers' Car Market. We could have held out for the full asking price, and we would probably have got it but we only had two days to sell it before moving on in our travels. We took the first decent offer but the net result was that our transport and accommodation only cost us £200 !!