I took advantage of the M&P 40 S&W trade -ins back in 2016 when I picked a Detroit PD trade in that was basically new from Bud's Gunshop for $300.
It came with three magazines, night sights that still had some life, all of the grip inserts and the paperwork still in the sealed plastic bag.
The only thing I have done to it has been change out the sights and upgrade the trigger; it continues to motor on.
I think that it was money well spent.
StarchedCover
I bought one of those Detroit PD pistols from Bud's at about the same time, I honestly think mine was ever issued or fired before I received it. If it was, it was very little. The only thing I changed was to add an Apex sear to reduce the trigger pull. Great pistol.
Night sights are kaput now, I need to replace those.