They don't give the full 30% off:
Order Subtotal:
$139.99
You Save:
$23.80
Note: Discounted subtotal does not include shipping, tax, and insurance. Additional charges may apply.
Discounted Subtotal:
$116.19
Quite clearly states UP TO 30% off in the banner on the top of the sales page. If you actually go to the info page and read the details it states
Discounts and Promotion Code Policy
Discount Policy: Offers are subject to change without notice. Discounts and promotions cannot be combined or used in conjunction with any other offer. While most products we offer are eligible for a discount, some products may be discount exempt. Generally, these items are noted in the catalog or on our web site and include information pertaining to the eligibility of a discount. Discount exempt items include, but may not be limited to: Kit items (most kits are pre-discounted), special orders, and promotional products. Other promotions offering a percentage discount, free shipping, etc. are subject to these exclusions. Maximum discount on some items may be less than promotional discount offered. Please consult a sales associate to verify discounted items and shipping when placing your order.