I've bought 8 used kegs, prices varied from 30-50 dollars. Most off CL and they were local pickup. As homebrewing becomes more popular corny keg prices increase. I'd say if in your particular area of the country you find a good deal on used cornies in half decent shape..ie, they hold pressure, buy them first. Eventually the good deals will be mostly gone. Maybe they are mostly gone, but there are still a few treasures if you're patient.