your fiancee needs a lot more money to get a car then just $600. for just a down payment. He needs at least $3,000. to $6,000. for a used car and a new car $10,000. at the least for a $25,000. new car with a 3 year warren tee.
If he can't afford that , then he needs to get a bicycle or take up
walking. $600. would buy a bicycle not a car.
he can move close to his work and maybe get a 2nd job if the car is
that important to him.
They do have Police sales and state sales where old cars can be gotten at auctions so that is the only hope of getting a cheap Lemon but the 2nd job is the safest bet and working for 1 to 2 years to get the down payment living close to the two jobs.