Through 9/30/18, Checks Unlimited is offering 1st time customers a box of singles checks for $5.50 with free shipping, down from $22.99! All you have to do is use promo code 9TNT when choosing your checks and you'll knock 75% off a single box of checks.
You can also opt for a box of duplicates for only $1 more. If you need checks in bulk, they're also offering your 4th box for free, bringing the cost per box close to $4 each.
My bank charges way more than $5.50 per box. Even Walmart sells them at close to $10 after shipping! This is a great deal if any Hiffers are in the market for new checks.