Amazon offers Prime members the Casio Unisex Solar Easy-to-Read Watch, model no. MTP-S100D-1BVCF, for $19.99 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $4.48.) That's $35 off list and the lowest total price we could find. It features a stainless steel case and bracelet, quartz movement, solar rechargeable battery, and water resistance to 165 feet.