The easiest and quickest is going to be Ebay. There's one with the right mount for $1500.00 now. If a reproduction scope is good enough for you, try sportsmansguide.com website. They have them for about $350.00. If wanting a REAL one, make sure it has a serial number plate screwed on the side. If the lettering is real white, it's probably a reproduction as the real ones will have yellowed by now.