Massdrop offers the Glycine Combat Sub Watch in several styles for $399.99 with free shipping. (The style choices will show in-cart.) That's the lowest price we could find by $15, although most styles cost $510 or more elsewhere. Features include a Glycine automatic movement, 38-hour power reserve, stainless steel case, and water resistance to 656 feet.
Note: This item is expected to ship on June 8.