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Google caches/save web page snapshote. I'm not sure how often. Does
the google cached version of this site have the old prices? If so,
that might indicate when they were changed.
Also, look at the source for the page (view->source). Some editors
that create web pages date stamp them. You could tell when it was last
updated.
Also, your browser can cache web pages. But a commerce site should
set the pages such that a browser won't cache them. Looking at the
page source might show if this has been done, or not (and if set, that
would compeltly rule out a cached page on the browser). I say might
because the HTTP response header can also indicate if the page should
not be cached and you won't see that in the page's source.
To see how a browser cache can work do this (for internet explorer):
File pull down --> Work Offline
Selecting Work Offline will "check" it on. Then type in the URL of the
site. If it comes up, it is cached on your system. If it pops up a
message indicating you have to connect then the page isn't cached (you
should visit the site's page before the test.) You can try it with
various pages in your history to see what sites can be cached and what
sites can't. Working offline is typically used by people with dial up
accounts to get a page without causing a dial into their service provider.
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