Checks Unlimited continues to cut up to 70% off select checks via coupon code "9B5X". With free shipping, that's tied with our mention from a week ago as one of the best discounts we've seen from Checks Unlimited.
A best bet is one box of Penguin Parade Checks (pictured) for $18.99 before the coupon, $7.50 after. Even better, buy four boxes for $22.50 after the discount ($5.63/box). With free shipping, that's $24 off and the lowest total price we could find.