Express Shipping is a service that "say's" you will receive your package in 1-2 days depending on when it was sent. It also cost's more money and might require a signature from the sender unless stated.
Priority shipping is half the price and will deliver in most cases 2-4 business days. In most case's the item arrived just as fast with Priority mail. It cannot be tracked so if delivery confirmation is a issue sent it certified return receipt.
RIP Blue Jay 9.15.12
1 Veil tail Betta, 1 Albino Betta, 1 Fan Tail Betta, 3 Cory Catfish