Product review (4 stars): Tape before buying a replacement
Before buying a replacement, if yours broke on the sides where the clear plastic attaches to the white back, you may want to try securing inside and outside with wide, clear packing tape.  I'd suggest doing any sides that didn't break, because they is likely to break too if you are putting multiple gallon bottles in the bin.  If you are really careful with the application, no one would notice the tape.  After a year of this remedy, I have had no issues with the bin holding firm, so this appears to be a permanent solution.

Update: Two years in, still holding firm, and the shelf holds lots of cartons.