B-Square has a clamp on mount that uses standard Weaver rings. Burris made a mount at one time but I think it has been discontinued. You could check with them directly. www.burrisoptics.com
As to a scope Burris 2X should be in your ballpark price wise.
My DW 357Max SuperMag has a Leupold 2X mounted. I don't care for it that much and will eventually replace it. The reticle completely washes out in bright light.
Take Care