Perhaps not the right thread or even the right forum, but I have a like new Vortex VMX-3T 3X magnifier for a red dot sight. Still have all the accessories, including the base and mount, the box, and even the microfiber cloth it came with. I mounted it behind my Aimpoint Micro and it definitely worked as advertised (quite well I might add). Per Eurooptic "This Vortex VMX3 Magnifier with flip mount features fully multi-coated lenses, a matte black finish, and a waterproof/fogproof exterior." It can be easily and quickly flipped to your preferred side (depending on how you mount the base) when in CQB or equivalent situations arise where 3x magnification is not needed. I used it 2 times, at the range only, and just never really got used to it. I spent a long time in 1st Ranger Battalion with an Elcan on my M4 (having the 4x at the flip of a lever came in handy on many missions) and thought this would be the next best option (I couldn't afford an Elcan at the time), but I just never took to it. Anyway, most places are selling them brand new for $199. I'll let mine go for $100 + shipping only because I need the money currently. I think that is a pretty stellar deal considering the condition.
Will consider trades, but prefer the money. Pics below.
Will consider trades, but prefer the money. Pics below.