anyway I would not equate a free workshop or two with anything more specific about the many and plenty ways to get a green card. You cannot possibly expect them to be able to know everything about all the pathways, none of which come directly from being a student.
As for the high cost of fees, there is no college where international students are charged a premium ( well maybe the visa mills but I really hope you are not at one of those). Private colleges charge the same for everyone, and publics charge the same for out of state regardless if that is one of the other states or another country.