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Any other similar stories?
Any page within Google can have a price on it. I have the same product several times within my site for various reasons including promotions. Google can have three or four different prices shown to the customer, depending on what they search for.
So far, very few complaints. I only honour the latest price on the site - I will not honour a Google or other search engine price (which can be weeks, if not months out of date).
You can explain it like advertising. A magazine advert can go out months after it was written, and the price can change during this time. In the UK, E&OE is used to cover this legally (errors and omissions excepted, I think!).
If it is really becoming a serious problem:
[google.com...]
<META NAME="GOOGLEBOT" CONTENT="NOARCHIVE">
(Hmm, 'snippets in the serps', sounds like a missing line from 'flagon with the dragon'.)
(Useless factoid: Another common use of "ransom note" is to describe overuse of fonts and sizes by newbie desktop publishers.)