Elsevier: How much is a corrigendum worth?

Here's a diversion – as I am sat watching England lose to New Zealand… (Note that I read this without University access as it's easier to realise what it's like not to have it).

I'm interested in how easy or difficult it is to find crystallographic structures in various publishers and I've turned to Tetrahedron – an Elsevier journal. Tetrahedron does not allow -or at least does not seem to encourage – its authors to expose their crystallographic data as supplemental information. I wrote to them last year asking if they would consider doing so. After all RSC, IUCr and ACS do. None of the five editors replied. Well – I'm only a reader.

Anyway I turned to the latest issue. No luck (I didn't expect any). But there was one "article" of interest:

Corrigendum to "The potential of intermolecular NO interactions of nitro groups in crystal engineering, as revealed by structures of hexakis(4-nitrophenyl)benzene" [Tetrahedron 63(28) (2007) 6603–6613]
Page 7650
Eric Gagnon, Thierry Maris, Kenneth E. Maly, James D. Wuest
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Maybe I can find a (corrected ) structure in the corrigendum. After all, that is free…

… oops…

The corrigendum will cost me 31.50 USD.

I have to pay 31.50 USD to read the original article and then another 31.50 USD to find out it's wrong. I'd never have thought of such a clever way to make money.

I wonder how many words there are in it. If there are less than 31 (excluding the author rubric) then it's over a dollar a word. Perhaps someone can give this information in a comment (I don't want to get sued for comparing the price of articles.)