So I'm a starving university student whom is taking an elementary French class in the spring. I am required to get Horizons.

The 5th edition is selling around 150 bucks, but I can get the fourth edition for around $6.

before I decide to purchase the cheaper one, I would like to know if there are any major differences between the two. Does anyone have an answer to this?

(i also realize I should check with the professor, they have not responded yet)