Whew! The "set of 4" over $400,000?! This specific model Cheney has doesn;t even have a price set: http://www.perazzi.com/std/coord.asp?cdSrv=catalogo_prod&cdLng=en&idCategoria=55&
Here's another great place to buy a high quality shotgun if you're in the market.
http://www.hollandandholland.com/~newyork/newguns/index.htm