Just a quick clarification. The rates being quoted for Priority Mail are wrong. It is not $3.20 for the first pound. The $3.20 is for up to 2 pounds. Each additional pound adds about $1.30 or less (goes down slightly as the weight goes up). For example,3 pounds adds $1.30 for a cost of $4.50 , 4 pounds would be $5.40.