People need to set up near this event and buy weapons before the police purchase and destroy them. They have 30K to spend so I would guess you could easily beat their buying prices and still spend very little.
http://www.11alive.com/news/local/a...k-event-heres-what-you-need-to-know/444089817
http://www.11alive.com/news/local/a...k-event-heres-what-you-need-to-know/444089817