I took a rock (or other flying object) to the center sliding pane of glass on my truck while mowing. Luckily I was able to find the part at a local Dodge dealer for about $126 plus tax.
The worst part was cleaning up all the little bits of glass from the break. I can only image that in an accident someone in the back seat would have cuts all over.
Replacement is rather simple, just remove the top and bottom track inserts, slide the new pane into the top rail then drop into bottom rail. All that’s left is sliding the track inserts back in. One small issue was the center seat belt. I had to remove the cover and very carefully slide the pane in behind it so that it would engage with the top track. Overall, rather simple and quick.
I found this video on YouTube of someone changing their window which was rather helpful.