"Thanks!" to New York & Paris (in this post), who shared the following news.
The latest J.Crew catalog sent to customers may have a unique promotional code (for something like 20% off on any order, free shipping with no minimum, or $20 off a certain amount).
The code is found on the back cover. New York & Paris also shares in this post: "The catalog with the discount code had a bright orange "cover" over the regular catalog, making the code pretty difficult to miss. ..."
So double-check your catalog to see if you got a unique promo code too! :)