Xuan_ZYes, there's a deal on Amazon that was featured on SLICKDEALS.
I was in for a 8" and a 10" here, but ended up getting them there for $5 less, overall. It was sold by a third party vendor, but fulfilled by Amazon with Prime shipping and returns.
I don't know how it works for third party sellers, but Amazon has a dynamic pricing structure. So it may be that the price may increase again to the point where the Massdrop price may be the better bargain at some point.