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runscottI recommend adding -(rp,pf,reprint,replica,AAA) and then left-clicking the box to the left of "In titles and descriptions" (found under "search"). This will eliminate all "feldman234" cards, as well as anything graded by the "super tough AAA" and any of those reprinted panoramas that have flooded ebay.
If there is a particular seller that I really don't like, I try to find some unique bit of text in their description and add it to the -( , ,) clause as well. For instance, if you don't trust any sellers who have "sold as is" in their description, or some other phrase that might indicate fraud to you, simply add that to your search:
-(rp,pf,reprint,replica,AAA,"sold as is","god bless")
On the other hand, if someone has a description that says "this ain't no reprint!", their item will also be eliminated from the above example search.