Great question — Great thread....
Discovery scopes were the goto for airgunners for inexpensive yet quality optics.
A couple of years ago they renamed Discoveryopt.
And then they started to ignore airgunners....
Because they discontinued most of their scopes — almost all of them with min. 10y parallax.
➠ And the new scopes they offer usually have
25y parallax (some 20y).

The scopes they offer seem nice, and they have great features, even improving on their former offerings.
➠
But I'm an airgunner, and I need my gun to shoot close range and be in focus, because urban backyards, garages, and farm buildings often require 10y shots. For scope-caming a deal breaker.

I had been recommending Discovery for a good while now — but for me
➧➧ Vector Optics 
has taken Discovery's place. Their Continental line has great features and specs. And they still offer budget scopes.
Store:
High value riflescopes, LPVO, red dot sight, binocular, monocular, spotting scope, laser, flashlight, accessories, digital night vision, thermal imaging monocular. Vector Optics accompany your every shot.
vector2007.com
Manufacturer:
Vector Optics is devoted to making high-quality rifle scopes & other optics with competitive prices & consistent quality. Accompany your every shot.
www.vectoroptics.com
WestHunter seems to be in process of establishing itself like several years ago Discovery and Vector. Their offering is much more limited, and their rapid changing of models is confusing.
Matthias