I agree 100% with the mount, but the scope I don't know... Seems like a lot of $ for what you get, plus I don't know about it's quality or strength. I don't what scopes cost is CA, but I just bought one of these for $90 or 100US (I forget):
http://tinyurl.com/hncjbm3 and the shorter version of the same for ~$15-20 more. I think for the $ they're pretty cool. The Leapers scopes have a rep for being strong, and "TS" means it's the strong version on top of that. I chose these mainly because I wanted the side parallax adj because it's way more convenient than the type on the front. That and the other features 44mm and 3-12x were nice. The illuminated reticle I could care less about and will never use, but that's how they come. If you just want a cheap generic scope that works then I'd consider a simple 4x32, which is what maybe half my guns have. Specifically the 4x32 that comes with the Crosman or whatever gun. They work fine imo but all depends on what you consider acceptable. Lots of people upgrade that oem 4x32 to something like the Leapers so I'm sure there are lots of people willing to sell their old one. The last used scope I bought was $20 delivered, which I think was a 3-9x40 Gamo.
Another scope you might check out is the 4-16x40AO Centerpoint, which is ~$75US, and that's very cheap for those specs. Plus it's better quality than similar scopes, like the 3-9x40AO that come with Crosman guns.
Just be wary of odd or cheap brands because they probably suck. Also know that firearm scopes have a parallax setting further out, which imo needs to be adjusted before airgun use. Plus firearm scopes may not be strong enough. Like 4x32 for a 22LR might be very weak since the mfg knows it'll never see any abuse.