Just outta curiosity what trade sites do you go to when looking for deals or just to see what's out on the market? Could apply to more than just firearms, for example I deal occasionally in rare balisong knives, but firearms are the primary trade.
Gunbroker is the most obvious but I've also used Armslist (used to use it a lot more until they eliminated the ability to search by caliber...) and Midwest Gun Trader here in KS.
Gunbroker is the most obvious but I've also used Armslist (used to use it a lot more until they eliminated the ability to search by caliber...) and Midwest Gun Trader here in KS.