Ideel (formerly Ideeli) is a women's designer fashion daily deal site featuring sales up to 80% off every day at noon on clothing, shoes, handbags, and more. Their offers are so good that they were ranked in 2010 as the fastest growing country in the US and were bought out by Groupon in January 2015.
The way their business works is by getting a hold of surplus or a very small sample of high end merchandise, then selling it off quickly with steep discounts. Their best promo codes are usually 20% off, but have been known to go as high as 40% off sitewide. Their coupons are valid on the highest of high end merchandise, like Prada, which is normally exempt from discounts on other sites. Sales usually last less than two days to keep turnover high.