Right now at OfficeDepot.com they have the 24 pack of Black Retractable Ballpoint Zebra pens for just $3.00. Use the promo code 52692148 and you can get another $.75 off = $2.25! Choose in store pick up and you will avoid any shipping cost.
They also have the 24 count of Red, Blue and Black available at the same price. Just use the promo code 52692148 when checking out!