Costco members normally can purchase the Dell U2718Q for $449.99 but a promotion is currently running for $80 off bringing the price down to $369.99. Solid deal IMHO. Shipping costs $9.99.
Edit: Promotion duration: "$80 manufacturer’s savings** is valid 1/28/19 through 2/25/19. While supplies last."
https://www.costco.com/Dell-U2718…04042.h