E-worldseller via eBay offers the U8 Bluetooth Smartwatch for Android and iOS in Black, White, or Red for $16.45 with free shipping. (Eachbid via Amazon charges a few cents more.) That's tied with our mention from last week as the lowest total price we've seen for this smartwatch. (It's also a buck under the best price we could find elsewhere today.) Features include a passometer, calendar, call sync, calculator, clock, and stopwatch.
Note: This item ships from mainland China and should arrive in two to four weeks.