Reviving this thread a bit - the "sagging" in the video linked above in ours resulted in it cracking in half.
Here's a l
ink to a replacement for the part that broke on ours - $159.
I'd just pay that and move on, but I'd rather pay for a wire shelf replacement that won't crack again.
This site has custom size wire shelves for about $60, but one difference is the thickness and the tabs that stick out (which I assume are to let you pull the shelf out. I'm OK with the shelf being fixed in the fridge, I wonder what I would use to hold it in place?