Every school is going to have a different set of financial characteristics associated with attendance. One school, Cooper Union, made news recently because it was dropping its 'free tuition' for undergrad attendance:
http://www.nytimes.com/2013/04/24/n...dergraduates-tuition.html?pagewanted=all&_r=0
While the number of such schools is dwindling, C-U was not the last such school in this country. This is why sources like the US News & World Report 'Best Colleges' report is a handy guide to have.
There is still only one curriculum and one degree offered, but if you want to study naval architecture & marine engineering, and not pay a lot to do so, my alma mater, the Webb Institute, is still 'tuition free', although you get to pay a room & board fee (all students live on campus) and you've got to buy your textbooks:
http://www.webb.edu/
Webb celebrates its 125th anniversary this year, and the 'tuition free' feature derives by benefit of the financial endowment of its namesake and founder, William Henry Webb. (Caution: shameless plug)
One of the benefits also deriving from this windfall (more valuable in years past) is that all paper for schoolwork (loose leaf, drafting, graph, etc.) was available to students at no charge. With the rise of computers, I'm not sure how much paper is used nowadays by the students.
So, it is still possible, but ever more unlikely, that one can find an almost free college education in the US. Certainly, there is a wide range of cost one can pay to obtain the same degree at different institutions, which is why it is important to do careful shopping for an education as one would do when purchasing any large-ticket item, like a house or a car.