I can't remember who, but they did an excellent video on ThouTube.

Where, you want an expensive car?
Each month, save your amount you would pay for a car.
Buy a used car for that amount, drive it for a year, while saving the same each month.
Then sell that car (for almost what you paid for it) and use that and your savings to buy a better car.
Repeat until you have the level of car you want.