Pistol scopes are great if you understand the limitations of shooting with them.
Swift makes good quality handgun scope. They start somewhere around $100. Their top of the line scopes run in excess of $400. Nikon and Leupold are also excellent choices.
Adjusting to a handgun scope is completely different than using a rifle scope. Some shooters never make the adjustment and end up getting rid of the pistol scope alltogether. From personal experience a scope with more than 3X power on a handgun is quite difficult to steady and sight properly. To use a scope to the greatest advantage you must be dead steady with the pistol. Every tiny movement you make is amplified by the greater magnification. If you have steady hands, and don't get "Buck Fever", a pistol scope can make a huge improvement in your hunting success.
Shop carefully, and try out as many as possible befroe committing to the one you buy.
A pistol scope is designed with long eye relief. Sometimes as long as 15-18" depending on the scope. Add your arm extension and the additional weight of the scope on your pistol into your ability to remain steady, and you'll get an idea what's required. If you can't hold the pistol steady without the scope, you'll never be able to hold it steady with one.
My pistol scope is set a 2X and I rarely use it at any other magnification, unless I'm using it as a spotting scope for medium range targets.
For me the pistol scope I own was a good investment. I hope yours will be too.
Regards,
Gearcecker