This isn't a bad red dot. It has auto off and motion wake so you never need to turn it on or off. I see this thing selling for $100 on a regular basis but it's still a pretty good deal.
https://www.primaryarms.com/sig-sauer-romeo-5-red-dot-sight-1x20mm-2-moa-ar-mount
The Sig Sauer ROMEO 5 compact red dot sights provide civilians and armed professionals a robust 1x aiming solution for any situation. The sights are parallax-free so point-of-aim and point-of-impact remain the same. Unlimited eye-relief allows you to acquire the aiming point and the target regardless of the position of your eye behind the sight. The readily available CR2032 battery is side-loading, allowing for quick battery replacement (featuring 5,000 hours or more of life). Dependable waterproof (IPX-7 rated for complete water immersion up to 1 atmosphere) and fog-proof performance.
https://www.primaryarms.com/sig-sauer-romeo-5-red-dot-sight-1x20mm-2-moa-ar-mount