6. Browning Buckmark URX .177-Caliber Air Pistol
Whether you are interested in plinking or going after small varmints, the $49.99 Browning Buckmark URX .177 is a good budget friendly choice. The break-barrel action and single-stroke cocking mechanism works in concert with a spring piston to provide accurate results and downrange action of 320 feet per second.
The ambidextrous grip is extremely comfortable and easy to hold on to. You can mount optics with the integrated Weaver rail, and the gun comes with a fixed front blade and an adjustable rear sight. Be aware that you will get the best results from using paper for target practice. You may not be able to deal with larger pests without investing in a higher quality air pistol, but this is still a gun that is fun to shoot and retails for a very low price.