In Jordan you either go to a key club or buy it from auto mechanics - only the proper bottled stuff is street sold. I'm not joking about "industrial solvent." Quality, well, the worst stuff won't send you blind for too long, but mostly it's pretty decent stuff. Think Smirnoff, or Bells whiskey levels. The sellers have an interest in not ripping off the customers too much as their customers are local too.
Street vendors though, you are chancing it. Coloured water with a dash of antifreeze, mostly.