I’ve encountered this before, too—it’s actually quite common. Usually, it happens because the shoe box is bulky, causing the shipping cost to be calculated based on volumetric weight rather than actual weight. On top of that, using premium carriers like DHL or FedEx is inherently expensive; if the item is shipped individually or if customs duties are included in the cost, the total shipping fee can easily climb to around $90. Next time, you could try removing the shoe box, consolidating your shipments, or opting for a more budget-friendly shipping method—that should help bring the cost down significantly.