WatchUlink you post is blue dial only, mass drop price is 429. the link you cite has ranges for selling prices between 453.89 and 750.00, mass drop is cheaper
Elkyamazon doesn't give anything, the price of the watch reflects a purchase of a third party (asurion) warranty, whether or not the level of service asurion provides is good or of value is a different discussion. warranty's have a hard cost line item addition to the selling price, exclusion of the warranty allows for additional price breaks, in the amazon example, their purchase agreement allows for an economy of scale that results in less per unit (warranty agreement) pricing. Mass drop could offer similar agreements but then their selling prices would reflect the higher cost to them to offer said good, then there would be people raising a stink about the price even more and saying they'd take a cheaper price if they could do w no third party warranty.
Tissot Men's T0554301104700 PRC 200 Analog Display Swiss Automatic Silver-Tone Watch https://www.amazon.com/dp/B00KIN9VHC/ref=cm_sw_r_cp_apa_UkItBbYFHXFJ6