Gilmour Electric Water Timer for $12.99.  Shipping is $5.99, which comes to a total of $18.98 shipped.  Here is a screenshot for your reference.  This water timer offers 4 on/off watering cycles per day.  The one-week clock repeats the cycle every 7 days and the skip function allows watering every 2nd or 3rd day.  In addition, it has a low battery indicator when power is running low.  Valid on 5/12 only.  Most places have this water timer for over $50.