Replying to Backyard Jib for summer

So Im trying to build my first jib. I actually have a 10 ft skinny box built and ready to go. But I still need a little takeoff ramp. I'm broke as shit and really trying to make this as cheap as possible. As long as I can jib it, I don't care how ghetto rigged that shit is. So my main question is, Does anyone know where to get astro turf the cheapest? Also, anyone know anything better then astro turf? And, any simple suggestions  for a little drop in or take off ramp? Any help would be Gnar!