There is also Moe's which offers guac for free, but the difference is that they give you 2 tbsp instead of the giant serving Chipotle does, which people might prefer to have and dont mind paying for.

Is there such a thing as imitation guac?

There was a scandal a while back where Kraft was calling a dip 'guacamole' despite having barely any avocado in it: http://articles.latimes.com/2006/nov/30/business/fi-fakeguac...

"We think customers understand that it isn't made from avocado," said Claire Regan, Kraft Foods' vice president of corporate affairs. "All of the ingredients are listed on the label for consumers to reference."

I imagine so, but I have not seen it.

That said, I see guac thinned all the time with salsa (esp. tomatillo-based salsas).

Sometimes sour cream, too.

That is criminal.