ramps.... you want the truth? don't even buy them. I have a ton of ramps in my garage people would trade them to me with parts they wanted to get rid of as a bonus. I used to take them thinking oh cool a set of ramps.
Ramps are the biggest non-use gimmick ever. you will get more function from 4 heavy duty jack stands and a good floor jack then anything else besides a real lift.
ramps require you to have the tires on the car for use. 90% of the time when the car is up in the air you will have a tire off for some reason either increasing access or brake service. The ramps will also block off large ares of side access to the car when in use.
most modern cars are low and cannot even get up most ramps as the angle is too steep and the front bumper will hit on the way up and down.
you want free ramps? come over i'll give you 4 sets of them to curse the next victim LOL.
seriously get jack stands, a good jack and then learn the strong jack points on your car and do not fall in the ramps curse trap.