Ebairsoft.com, ehobbyasia.com, airsoftgi just to name a few. Airsoftparts.ca?
You need a dragonuv SVD scope if you want to be authentic. It is also an AK side mount, not a standard weaver rail. Or you could buy a new machinery cover with a rail on it and mount a regular rifle scope if you want.
Travis R. (aka Trapper)
Canadian Airsoft Marines. Field owner