Walmart offers the Casio Men's Digital Watch, model no. AE1000W-1B, for $15.43. (Amazon charges the same with free shipping for Prime members.) Opt for in-store pickup to dodge the $4.97 shipping fee. That's $2 under our September mention and the lowest total price we've seen. (It's also a current price low by $4, outside the mention below and other Amazon sellers.) It features a black resin band and case, quartz movement, world map time zone display, and water resistance to 330 feet.
A close price: Best Buy via eBay offers it for pennies more.