Just to clarify what a couple people already mentioned, you can search google and use a search term that will serve to narrow down the results to results only from a particular URL, such as this forum.
To do that, you enter search terms separated by commas like usual and then include the additional term "site:http://www.largeformatphotography.info/forum/" without the quotes and with no space between the colon and the beginning of the URL. You could narrow it down further within the forum by copying the URL of the classifieds, for example, to search only the classified ads.
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