I've purchased a few guns at the PA store. I agree with many posts, it's somewhat luck of the draw as to who you get in the GL. I've had guys that would take me to the O/Us when I asked if they had an Ithaca 100, and I've had guys that would be able to pick out a bunch of good selections when I asked to see an entry level sporting clays O/U.
As for price, you just have to check out everything and see. I got a great deal on a Caesar Guerini there, as well as a belgian A5...but I've seen SKB 100/280s and BSS so far off the scale it was laughable. I'll admit I'm not knowledgeable to the higher end stuff, but imagine similar price disparities are found on up the line. They will deal on price, especially if you're willing to take your discount in the form of merchandise. I went in with a group of 6 friends and talked to the GL guy, he gave us a nice discount for the group buy. Overall, my experience is positive with Cabela's and I frankly don't get the bad rap that it gets...but perhaps other stores are not run the same as the one in PA. You won't find any true steals, but you can get to the low end of market with some work.