Same, I've never seen a wrangler a pull-a-part. Used to go there all the time for Cherokee parts, which go incredibly fast. If its been on the lot very long, chances are its been fully scavenged(XJs that is).
I've picked up tons of used parts for my jeep - but never actually went to a junk yard. Once you figure out what you need, just check the classifieds on here, jeepforum.com, craigslist, and ebay. A lot of times, the junk yards will be more expensive than what you find online. Obviously this works best for smaller parts that are not expensive to ship. And here's a link for one other good resource: