This is just an old recycled concept. I bought some of my first stereo gear at 'Bank Seized' or 'Liquidation Sale' warehouse-type things they used to have every six months in the Denver metro area back in the 1970s. Usually at 'Big Mac', McNichols Auditorium. I got my turntable there back in the day. Good prices can be had, but they also sell a lot of junk mixed in with the good stuff. And yes, they know what it all goes for. Bargains yes, but not extreme bargains, usually.
I'd go if I was in the area, but it's not like this is a new thing. You guys just aren't old enough to remember the glorious good old days.