For new customers only, take up to 70% off checks when you enter the coupon code 9TNT at checkout at Checks Unlimited. Plus shipping is free. This matches the highest discount we've seen from them. Choose from over 100 designs. For example, the pictured checks drop from $18.99 to $5.50 after the code, or to $6.50 for duplicates. You'll get a greater discount if you buy more than one box. Note that there is a limit of four boxes per customer with this code. Sales tax is charged in most states.