I have a v2 Knoxx Stock for a Remington 870. It's used, but 100% functional. Also included is the add on "PowerPak" which provides a watertight storage tube (for batteries or such) and a 5 shell holder. Includes installation tool.
The stock alone goes for ~$100 and the PowerPak for ~$35. I'd like $80 + shipping via PayPal or check.