Given that the front end must be just grounding-out, otherwise the front will have suffered significant damage – I reckon that the cheapest option would be paving slabs fixed at just the right location. Only 2 would be required if aligned correctly with the tyre spacing; just make sure that once the front tyres leave the paving slabs that there is...
a car with a higher body, presumably, like a 4WD. Is there any way you could smooth out the steepness? If not, you've just got the wrong car for your environment.
Use something, eg: plank of wood, to build up the level in front of the garage.
So as to lift the front of the car before it hits the garage floor.
A couple of pieces of metal placed where the wheels travel will do the same job.
Given that the front end must be just grounding-out, otherwise the front will have suffered significant damage – I reckon that the cheapest option would be paving slabs fixed at just the right location.
Only 2 would be required if aligned correctly with the tyre spacing; just make sure that once the front tyres leave the paving slabs that there is sufficient clearance to withstand the suspension drop to remain clear of the garage base.