bnaceThe Amazon offering is 14C28N steel while the Massdrop offering is S30V steel. According to the posts above the combination of the blue handle and the S30V steel is the exclusive part.
opelloActually, its the combo of the blue handle, steel, and blackwash DLC. Heck, even if it wasn't exclusive, its still not overpriced compared to the regular s30v blur..
http://www.amazon.com/Kershaw-1670NBSW-SpeedSafe-Stonewash-Finish/dp/B00U0LNMG8/ref=sr_1_4?ie=UTF8&qid=1440886054&sr=8-4&keywords=kershaw+blur