While thousands of Seattle residents lined up for hours to trade their handguns, rifles and family heirlooms away in exchange for up to $200 in gift cards as part of the city’s latest gun buyback program, gun collectors who have seen prices for assault rifles and firearms accessories almost triple since November took advantage of a huge opportunity.

Police stood in awe as gun enthusiasts and collectors waved wads of cash for the guns being held by those standing in line for the buyback program.

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Police officers in Seattle, Washington held their first gun buyback program in 20 years this weekend, underneath interstate 5, and soon found that private gun collectors were working the large crowd as little makeshift gun shows began dotting the parking lot and sidewalks.