When looking for a luxury car, the usual approach is to zero in on a vehicle produced by a manufacturer that tends to specialize in building them. Think Range Rover, or perhaps German premium automakers like BMW and Mercedes-Benz. That can get pretty tricky if you’ve got a more limited budget, let’s say closer to $30,000, which is well below the current average price for a new car on sale in the US. For that budget, you could net yourself a tidy, low-mileage 2021 BMW X3 xDrive30i.