Non-stick griddle frustration
Your question doesn't indicate that you are using any fats when making your pancakes. Many people make the mistake of thinking that just because it's nonstick that you can get away with not greasing the griddle. This is just wrong.

I always run a stick of butter over the heated griddle a few times, then rub it in with a paper towel. You want a really thin layer of butter on your griddle. After cooking a few pancakes you will need to do this again.

I've used really cheap electric griddles just fine with this method, the problem you usually have with a cheap electric griddle is hot spots, not sticking.