How much does a UPS business mailbox cost? UPS Mailbox Prices Small size boxes cost $10 to $30 per month, medium size boxes cost $20 to $40 per month, and large size boxes cost $30 to $50 per month.

In addition to its use as an LLC’s principal business address, the UPS Store mailbox address can also serve other purposes. In the UPS Store, the street address is used instead of the post office box.