There might be some used ones on EBay. From my experience you'd be better off buying a low end optic made for a real gun though(like a sightmark). Those fake EOtechs seem not to last long.
Im having that issue with a replica i picked up. Very reflective coating on the glass. I used it today for the first time in 6 months and i found that staying close up on it (which is what youre supposed to do anyway) eliminates the glare. But still sucksThe biggest issue I have encountered with replica EO Tech optics is the horribly-obtrusive mirror finish on the shooter-side lens. It makes using it in bright conditions problematic.