I have Ordered 16x L3+($462) with 1x 420 and 15x 350 coupons on 10 April. 
But few hours later, support told me that the order will be canceled due to coupons issues.(the coupons can only deduct no more than 50% of the product price).
Then i re-order 12x L3+($462) again with 12x 200 coupons.

$462-$200=262 still sweet.