What does it cost to mail a ready post box?

The cost to mail a ready post box varies based on its size, weight, and destination. For example, USPS offers flat-rate boxes that start at around $8.45 for a small box and can go up to $22.80 for a large box, regardless of weight, as long as it fits within the box's dimensions. Other carriers like UPS and FedEx have their own pricing structures. It's best to check the specific carrier's website for the most accurate and up-to-date pricing.