You will have a much easier time finding those non LSD axles. Check with local parts stores. They aren't that expensive...and buying a used axle might not be the best use of your money...and shipping wouldn't be too cheap...So in the long run, a local parts store might be your best bet.
A lot of times local parts stores will have rebuilt ones for $50-$75. You just need to give em you rold one or there is a core charge. Installation is usualy around $100 or if you are kinf od handy you can do it yourself.