Additional to Carl's subject of exclusion. The only way to really find those unexpected chips is to "walk the mall" but there is a way to make that more productive. After you run your searches for "derby" and whatever and you want to start wading through the rest, you can exclude a lot of the stuff you don't want to see. In the "Chips, other" search box (check both title and description) you can list words you want to exclude. Simply type minus parenthesis word comma word comma word parethesis. You don't even have to specify "chip" or chips" or any search word, just the words you wish to exclude. An example:

-(11.5, case, table, brothel)

This will eliminate chip sets advertising 11.5 gram chips, sets including a case, and those seas of blackjack tables. You can add other stuff you don't have any use for like brothel chips or your least favorite casino, etc.