What is cost to mail a ready post box?

The cost to mail a ReadyPost box varies depending on its size, weight, and destination. Generally, USPS offers flat-rate shipping options for these boxes, with prices starting around $8.45 for small flat-rate boxes and increasing for larger sizes. For the most accurate pricing, it's best to check the USPS website or visit a local post office, as rates can change and additional services may incur extra fees.