I remember seeing the discount tag in some course pages, but cant seem to find it no more!
Look for the “Certification Details” page towards the beginning of the course. There’s a 20% discount coupon code for ordering the LF exam. Also, if you watch the Linux Foundation site, you’ll periodically find sales that lower the cost as far as 40% off the full cost, but you’ll need to wait a month or two to see those kind of discounts.