Simply click the PayPal link associated with each movie (most times the link for PayPal is directly under the image of the DVD cover art) and PayPal will create an automatic invoice/shopping cart.  To continue adding more items to the PayPal, click the "Continue Shopping" link at the top right corner of the PayPal created shopping cart.
If making a purchase of only 1 item, the appropriate shipping cost will be calculated automatically (both domestic and international).  
For United States buyers, the shipping cost will disappear when you add  2 or more movies in the same purchase order. FREE SHIPPING WITHIN THE USA on all orders of 2 or more movies.