Here's my search string:

(casino,chip,chips,token,tokens,reno,las,vegas,lv,poker) -(machine,machines,strike,strikes)

I get 6000-8000 hits for a week's worth of listings with this selection and look at only those closing in the next 24 hours. I'm interested in tokens, poker chips, and other Nevada casino stuff, so included terms for them. I'm not interested in silver strikes and slot machines so put those terms in the second (exclude) part of the argument.