Sightmark is one of the companies who try and offer as much as possible for an affordable price. I visited their booth at Shot Show 2019, where I got to see what they have prepared for 2019:
Citadel 1–10x24 CR1, an under-500 $ riflescope with a 10x zoom factor. I have written an article about it, available here.
Shot Mini M-Spec red dot sight, an open reflex red dot with a sturdy frame. It features a 3 MOA red dot, is lightweight and compact. In the box, you also get a skeletonized riser for an AR platform. Without it, it is perfect for use and handguns and rifles of other types. It can be ordered with either a fixed or quick-detachable mount.