Endless Pens have been offering this pen for US$215 since before Christmas, and recently dropped the price to US$198. (Free shipping is a new thing that Endless Pens just brought in. By that, I mean free shipping across the board, since the US is hardly the only or the largest market for either luxury writing instruments or fountain pens in general.) So, no, I don't think this is Endless Pens selling on Massdrop as yet another marketplace platform.
By the way, I have recently received the second order of (this time, mainly Pelikan) pens I've placed with Endless Pens, and even though it didn't go exactly as I was expecting, the way they handled my complaint is testament to excellent customer service. If I were to buy the M405 Stresemann, it would be without a doubt from Endless Pens, on consideration of both pricing and proven (to me!) trustworthiness.