gun shop, gun show, pawn shop, Brownell's, estate sale, Mid Way USA, garage sale.
I'd start with Amazon. Your rifle is a Savage model 340, and if you search for Savage 340 scope mount, you will get a lot of hits. The mount and a set of rings is about $53.98. Shoot safe and often.
Search for Savage 340 scope mount. The Revelation 225 was manufactured by Savage. Several online retailers offer different styles.
Ebay has usually side mounts that fits the Savage 340 , Glenfield side mounts
You need a Weaver Side Mount #2 (which is the base). Weaver also make 1" side mount rings that mount onto this base. That's what I have on my .222 Savage 340.
Savage 325c rear peep?
The Savage springfield 840 is the later version of the Saveage 340. Midway USA has a #1 weaver mount for the 840. Under savage 340 they also offer a B-square mount with rings that has better reviews than the weaver mount.
Scope mounts that mount on the left side of the receiver using the four screw holes are available from Weaver.
B-Square offers a scope mount for the 340, the model number is 14600. It is offered by MidwayUSA for $49.99. May be hard to find unless you order direct from B-Square. See Midway Here: http://www.midwayusa.com/eproductpage.exe/showproduct?saleitemid=146614. Good Luck
the scope is not what you want to worry about, it is the scope mounting rings find rings that will fit to your toy and the scope will mount right on , do not expect the toy to shoot dead on because it is a toy not a real weapon . don't shoot your eye out or anyone Else's eye.
walmart
You have to mention the gun to get an answer.
there a a few things you can do you can mount it on the side it takes some getting used too but it works or you can get a special scope made for mounting farther forward there hard to find but they work great