Is it appropriate to haggle on, say, a venue for your wedding? I can accept "no" as the answer here, but I just want to make sure I am not missing an opportunity to save some dollars, especially if it is acceptable or even expected. My mom says it is fine but she cannot be trusted here. Everyone else I know is useless and I disregard internet wedding site etiquette advice as legit.

The place in question is an established venue with a price list.

What about other related things, like catering? Chairs n shit? Etc?