Product review (5 stars): Nearly impossible to find anymore.
I was very pleased to find these on Amazon.  They are no longer manufactured and the only ones available are the cheap, thin steel pieces.  These are the very heavy steel enameled units that were available but kinda pricy.  These are really pretty cheap.

Get them while you can cause they are not going to be around for much longer.  I picked up enough to get me by.  ;-)