Same price as yours, but this one is 2 generations newer(uses less power, better performance) and it's from an official retailer so there are no worries of scamming or anything as it comes with a warranty. Not calling you a scammer, but, people don't tend to trust other people online.
I would probably guess it's worth more like $150...? Not really sure, but that seems more reasonable to me than $210.
By the way, how in the world do you have a brand new(I assume it's sealed?) 2500k in 2014 lol? Just curious.
Yeah it's sealed and I bought it a year or so ago when I built another pc and never sold it because I thought I might use it for my newer build but then decided I wasnt going to bother overclocking so I went with a 3570.