Sale price or licensing fees of a work.
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Any combination of:
In metadata:
...
<book-meta>
...
<permissions>
<copyright-statement>...</copyright-statement>
<license license-type="ccc">
<license-p>0003-6951/2006/88(5)/051101/3/<price>$23.00</price></license-p>
</license>
</permissions>
<abstract>...</abstract>
</book-meta>
...
In a product description:
...
<product>
<name><surname>Lapeyre</surname>
<given-names>Deborah A.</given-names></name>
<name><surname>Usdin</surname>
<given-names>B. Tommie</given-names></name>
<source>Wildflowers of the Washington Area</source>
<year iso-8601-date="2002">2002</year>
<publisher-name>Lippman, Ltd.</publisher-name>
<publisher-loc>Bethesda, MD</publisher-loc>
<isbn>0-23-8675-309</isbn>, includes a CD-ROM,
<price>$19.95</price> (Used 12.50 when available)
</product>
...
...
<product>
<source>Image-Guided Radiation Therapy in Lymphoma Management.
The Increasing Role of Functional Imaging.</source>
<name name-style="western"><surname>Macklis</surname>
<given-names>R. M.</given-names></name>
<name name-style="western"><surname>Conti</surname>
<given-names>P. S.</given-names></name>
<publisher-name>Informa Healthcare</publisher-name>,
Essex, United Kingdom, 2010, Price: <price>$324.00</price>.
ISBN: <isbn>9781420058741</isbn>, 80 p. (hardcover)
</product>
...