I built some ramps with the wood from my porch that we took apart to pour a concrete porch.
Loosely followed this guide (as in: I read it several months before actually doing it): Mustangworld - Build yourself some ramps !
Works like a charm. I have a floor jack that has a slow let down, and I always have to borrow jack stands from my father-in-law. Got tired of waiting for him, or stacking up scraps of wood as a fail safe.
Now I just get my tires a few feet away from where I want them, hop out, line up the ramps, and slowly drive up. I cut the ends at a 30-45* angle for a smoother ride up, I just count the bumps, and stop about halfway to make sure the ramps aren't angled or anything. I screwed an extra board on the end that is a little bit wider, just in case I get off center a bit, I don't risk the ramps falling over. Just pay attention so you don't drive off the end of it, I've looked it over, and it wouldn't be pretty if that happened.
I've put both my 01 Trep, and my '10 Grand Caravan on them for oil changes and it's worked like a charm. Haven't had to do any major repairs since I built the ramps, but it's nice never having to worry about finding out that I put the stands right where I need my arm to go while I'm working. Gives lots of extra room for work under there.
In my case, other than a few screws, this was 100% free to me. I also have limited storage space so it's nice that when I'm finished, I can just flip one of them over and they overlap perfectly. When they're stored, it just looks like a pile of lumber.
Being incredibly unskilled with a circular saw, this took me about an hour to build on a saturday morning.