The subject line of a promotional email I got from Japanese book/eBook retailer honto. I also made an accompanying vocabulary list on Renshuu: https://renshuu.org/lesson/c/5681535/vocab/

24時間限定！≪お得なクーポン！≫ ／「買い逃してない？ 集英社準新刊一挙試し読みキャンペーン」など開催中！

Tutor-Consulted Translation

24 hours only! ≪Value Coupon!≫ “Have you missed out on anything? The Shueisha semi-new publication online preview campaign” and others are under way/(being held)!

Original Translation Attempt

Limited to 24 hours! ≪Bargain Coupon!≫ “Not missing a chance to buy? Shueisha semi-new publication online preview campaign” and others are under way!