Tanga offers the Meridian Point Weather Station
, model no. WS-12/2059, for $4.99
for shipping. Outside of the price below, that's the lowest total in-stock price we could find by $14, although we saw it for $3 less in February. It displays the current date, time, humidity, and more. It attaches to your keys and features an alarm clock.
A close price: With limited stock, Amazon offers it for $8.52 with free shipping via Prime.