I think a LGS or state-level gun trader/classifieds is a better way to go for common tactical Tupperware. I'd keep Gunbroker for rare or more specific items that people actively hunt for, like specific variants of S&W revolvers or a Roland Special Glock...….stuff that doesn't pop up everyday at the LGS where you need an educated buyer willing to pay the price, as opposed to the average low-balling mouthbreather who thinks everything is a Glock or AK.