I know a lot of people will disagree with me on this but this is the way I feel...
If you buy from websites based in China a good rule of thumb is don't buy technology (phones, computers, cars etc...) and food (baby food, formula etc...).
If you buy anything at all... textiles and cheap plastic things like cd holders and make sure they aren't priced over $5. This goes for palm reading too.
PS. Don't order more than one item at a time that way your never out more than $5.