This promotion gives you, effectively, 30% off when you use promo code 4JULY30, but only runs for one week.
Honestly, I think you’d be hard-pressed to come up with a $100 order from ComboInk because their prices are so rock bottom to start with! But if you’re ordering for more than one printer I guess you could hit it. ComboInk completely guarantees their products, but so far I’ve had to reason to test that guarantee.