Only problem with the Cast Iron -
I do not believe that anyone makes them for the 26-incher (at least, not yet).
I think that Weber's pricing on Replacement Grates is driven by two factors:
1. VOLUME - The 22-inch is by far the most popular size. They bang-out millions of these. The 26-inch is probably one of the least common, so it will cost more.
2. MATERIALS - The standard 18 and 22-inch grates are simply coated steel. Weber probably standardized on Stainless Steel for the 26-incher, so it costs more.
Add these factors up, and you get the "double-whammy" (See, the costs make sense from WEBERs point-of-view.) Plus it is usually 3-piece, which is more costly to fabricate.
Is there a size-difference between the Old and the New 26-incher? Or, did they just bring back the classic?