Compare Mail Services ServiceStarting PriceShip Time Priority Mail Express$28.75 (at Post Office & Online) $24.90 (Commercial)6Next-day to 2-day guarantee by 6 PM7 Priority Mail$9.35 (at Post Office & Online) $7.64 (Commercial)61-3 days11 First-Class Mail$0.63 (at Post Office & Online) $0.471 (Commercial)61-5 days 3 more rows