You can get an extra 10% coupon by signing up for email offers here:
See bottom of page where it says: "Never miss a great deal – plus, get a 10% coupon to save on PCs and Dell electronics - Sign up for Dell emails to stay in the know about the latest products and hottest deals on Dell.com. New subscribers receive a coupon for 10% off select PCs and Dell electronics." and click on the "Sign Me Up >" link.
This coupon also works on the LG OLED deals, for example, the 65" B8 w/ $300 gift card (https://slickdeals.net/f/13285810-lg-65-inch-b8-oled-oled65b8pua-1497-free-300-dell-egc
) was $1,347.30 before tax after the coupon.