It's listed below in Remington's 870 history section (you have to scroll down a bit). You'll see high-grade 870 Trap and Skeet guns from time-to-time at the bigger gunshows and high-end shops. They come out of the Custom Shop, of course, and they'll still build guns to your order.
http://www.remington.com/products/ar...ingmaster.aspx
http://www.remingtoncustom.com/Shotguns.aspx
I don't have a recent Blue Book, but it
should be in there. That will give you a good ballpark.