With classes starting up again over the next few weeks for most universities, you’re probably gearing up by grabbing everything you need for back-to-school. Even if you’re not a first year, there’s a lot to buy: notebooks, highlighters and pens, textbooks, dorm essentials and so much more. But the good thing is, not all of it has to cost a lot! In fact, you can get tons of your back-to-school essentials for just $20 or less! Just take a look…