The sales at GAP are usually 40-50% off and happen fairly often. What doesn’t happen often is GAP marking down a ton of styles to 60% off and then giving you that sitewide 40% off on top with the code HAPPY. The exclusions for the sitewide discount unfortunately include denim, but there are a bunch of jeans in the 60% off section at really great prices.
Here are a few styles to grab while they’re marked down: