Although the local camels were cheap, because the local people were more dependent on camels, they only agreed to rent two to Zhao Yu and his team.
Moreover, the desert residents were smart. They only sold the camels and not rented them. They asked Zhao Yu and the others to buy the camels at the price they had bought them at, and when they returned the camels in the future, they would return the money to them and only collect rent.
This way, even if the camel died, or if Zhao Yu and the others didn't make it back, they wouldn't suffer any losses.
Zhao Yu and the others had no choice but to spend some US dollars to buy the two camels.
In Western Sahara, single-humped camels were generally used. Although they were slightly larger than twin-humped camels, each camel could only fit one person.