Gives you a 20% discount on postage, so use it whenever you can.

Also, when you go to the post office some postal folks will charge the price of a parcel, versus standard mail. Even though there is a definite regulation regarding what is a parcel based on thickness in part, not every postal person knows or checks, making your prices somewhat subjective.

Using paypal allows you to get the same $2.04 price, prevents the trip to the Post Office, gives you tracking confirmation and allows you to stay in your pajamas.

Hope it helps.

Terrence