When you create personalised products in Tostadora you get volume discounts:
20% off from 3 items with the promo code PERSONALISE20
30% off from 5 items with the promo code PERSONALISE30
The discount is applied by entering the promo code on the order page.
Volume discounts cannot be combined with other promotions.
In this help article you can see how to validate a discount coupon:
Note: Promo code for US site tostadora.com is CUSTOMIZE20 and CUSTOMIZE30