Further information for others...
I came across a similar error, but the line was "....suggested_retail_price".
This was a problem in the .itmsp, not the .epub.
Turns out that if you use a tab delimited file to generate your metadata (as you would for multiple titles), you should use a "." in any Euro Physical List Price, rather than the more correct ",".
iTunes Producer (2.2.1) will still display it as "," but if it is "," in the .itmsp it throws an error.
I ended up fixing this by hand by editing each .itmsp file in Text Wrangler. Trying to correct it directly in iTP didn't work.
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