Make your own? I use soy sauce, vinegar, sugar, green onions, chili peppers, and a bit of sesame oil. Maybe add a bit of water to dilute. Adjust amounts to taste. Another option is taking some chili oil and mix it with some soy sauce.
I love my mom's homemade beef gyoza. Seriously, they're amazing (especially when I help to mince up all the greens really small; I hate huge chunks of something mixed in). But if for some reason you ever go to Japan, look for a franchise restaurant called Oh Sho. Seriously, they're known for their gyoza throughout Japan. I believe it was every Tuesday, but they have a special deal (I think it was like one serving of six for about $1.50 versus the regular of a little under $4.00 in Yen).
P.S. When I first saw the thread's name, I thought it was a thread in FB because I thought I missed an episode of Drawn Together or something.
Have you ever tried making some with some unconventional fillings? A friend of mine in Japan used to make gyoza with cheese and kaki (persimmon) slices in the middle as a dessert/snack kind of thing, and I have made cheeseburger potstickers that have come out quite nice. My brother really doesn't like cabbage, so it was an effort to get him to try them, but it's fun to do something different every so often.
Ling-Ling potstickers are teh sex. 
