They're about $700 or so. I bought the mount that clicks into the ATV frame used off facebook for $70, normally they're about $160 or so. In fact, I bought it from a guy in gettysburg, and I think there was another guy selling the mount on Facebook in gettysburg also.
Then the plow is I think $260 and the frame that articulates the plow I want to say is another $250. Basically whatever the MSRP on the polaris website is thats what the dealer will charge you. You'll also need a winch to run the plow.
I'd call Polaris and see if they have any deals or coupons for plows right now. I bought mine new but they gave me a $200 certificate for any polaris parts or accessories since I was "a loyal Polaris customer." Which is funny because this is my first 4 wheeler.
It is foolish and wrong to mourn the men who died. Rather we should thank God that such men lived.
I can buy the shear pins right at my dealer for less than $15 and they have a double end....break it and then flip it to the other side. Don't know if the newer Glacier plow systems changed that would increased the pin price but mine is on a 2015 570 EPS EFI Sportsman.