Amazon offers Prime members the Casio Men's Ana-Digi Sport Watch
, model no. AQ164W-7AV, for $20.85
with free shipping
. (Non-Prime members can spend $35 or more to qualify for free shipping; otherwise, shipping adds $4.48.) That's the lowest total price we could find by $9. It features a quartz movement, metal case, day, date, and month functions, and water resistance to 330 feet.