Hey Pioneer, what is your budget, a lot of people on the forum know I'm a hound when it comes to finding deals.
On the low end I've used Tasco pro points for a long time, and they have held up well, mostly on handguns but also on 12 gauge 1100. Battery life is not great, and had one front lens fall off, which is the coated part, so the dot washes out easier, but it still works. We shoot a .22lr carbine match at my local club, with most of us using AR .22lr conversions, most are using low end optics, like Tru Glo, NCstar, BSA, Barska etc... Most of them are working decent for the match we shoot, if the unit had a problem, it usually showed up quick, got repaired or exchanged and was ok after that. The single lens reflex designs that look like a C more, aren't beefy enough to whack it on a barricade, and the ones that have multiple reticles, don't shoot to the same point of aim, if you go from 1 reticle to another.
The Hakko and Oki dot are a step ahead of the lowest end.
Now to the medium to upper end.
1) C-Mores can be had new for under 250.00 bucks, very sturdy, and a good sight picture, bright in full sunlight, I like 2 minute dots on rifles, and I think the lowest they go is 4 minutes, not a deal breaker but that will cover up a head at 100 yards. The main draw back if you want to call it one, is the adjustment system is very coarse, get it sighted in and lock it down, never expecting to adjust it in the field.
2) The bushnell holo sight, not milspec like the Eotech, but a lot less money, and they are sturdy too.
3) Trijicon reflex, Msrp on these will scare you, but I got a used one on AR15dotcom, with an Arms quick release mount for 225.00 bucks, put it on my Marlin 336 levergun.
4) C class or older aimpoints. Again not milspec, but you still get a lot of good features, extended battery time and less money. I bought a used comp C3, with quick release mount for 360.00 on AR15dotcom as well. The mount go's for a hundred bucks. Side by side, I can't tell it from my comp M2 2x.
5) Look for quality used optics, that have lifetime warranties, lower cost and your covered if it breaks, unless it was abuse.
6) Not a red dot, but I picked up a 1.5x5 Leupold vari x 3, for 175.00 bucks, because it was mounted on a 7mm Mag, and they did not tighten the rings sufficiently and scratched the hell out of it, when it slipped under recoil. Scratches and dents don't bother me if it works. Msrp on that scope was 500 bills. It is on one of my 3 gun AR's.
Message me here, and I will try to find what you seek, I do it everday for me, would not mind doing it for you.

M25 Scopebroker