Banana Republic: One Day Sale!September 27, 2010 by Mitchell Wischmann This post may contain a link to an affiliate. See my disclosure policy for more information. Banana Republic has yet another one day sale running today! Get 30% off from 9am to 3pm ET and 25% off from 3:01pm until 11:59pm ET! Just use coupon code BRMONDAY at checkout.Don’t forget to go through ShopAtHome! You’ll get 4% cash back from your Banana Republic purchases.