FWIW, Crutchfield is showing both the LG 55LW6500, and if I remember right, also the 55LW9500 on their site (described as having the passive-3D), with "pre-order" status. (With the 55LW5600 of course being already available.) I didn't look at other sizes, though.
My own 55LW5600 is ordered from another vendor, and should show up by early next week. (The BD-670 Blu-ray player that was part of the bundle is showing up separately, supposedly on Saturday.)
As for ghosting with the LG passive 3D, I agree with twdll's and CureMode's comments, above. You definitely get ghosting if there is significant vertical angle (i.e., you are well above or below the perpendicular). So at the BestBuy where I saw the 55LW5600, you had to crouch/squat to get down to roughly eye-level, since the TV was sitting pretty low. I had known that this was a drawback of LG's passive 3D, and as I intend to put my set above a fireplace mantel, it was potentially a big concern for me. I'm going to use a tilt mount, which will make things exactly perpendicular to the main viewing/seating location. But I didn't want it SO sensitive that the angle was going to be critical. My impression at Best Buy was that you could still be 10 degrees or perhaps a bit more above or below the perpendicular, without ghosting becoming an issue. So if anything it was less sensitive to vertical angle than I thought it might be, going in. That said, anyone mounting one of these sets at well above eye-level should plan on using a tilting mount. (On the other hand, the set is very forgiving of side-angle viewing.)
As for the visibility of horizontal lines (in 3D mode), I was able to get about 6 feet away, and for me that was enough to no longer see the lines (which can be easily seen if you are only a few feet away). I have seen other reports where others (with better eyesight than me, perhaps) say that you want to be more like 7-8 feet away. So for people who like to be really close, this may not be the best choice, either.