There's a new empanada vendor called www.theempanadaking.com. Have sampled all 4 kinds and they are very good. They can be shipped or if you call, you may be able to make arrangements to pick them up when they are ready.
Easy to use online order form. Takes credit cards. Each package comes with a flyer suggesting how to bake them.
These are the real thing - not mass production. The guy who makes them is from Argentina. Give them a try. I don't think you'll be disappointed. Located in North Jersey area.