It depends on the area of China. It's usually pork, but it can also be chicken. In certain areas it could even be water buffalo, or in upper-end restaurants in China, just about anything from duck to starfish.

In the U.S., it's almost always pork, because pork is least expensive.

Here are some sources restaurants in North America use when they don't make their own:

http://order.bestwonton.com/

http://www.wontonandthings.com

http://wholesaleappetizers.com

These are just a few examples. Some Chinese restaurants will sell them wholesale to other restaurants as well.

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