When I was a student, I almost exclusively bought used computers online and generally had positive experiences, and never had a bad experience. It's not like a car where you need a professional pre-purchase inspection, it's pretty easy to check.
If you are going to get a used computer, check the remaining SSD life, remaining battery life, and inspect the screen for dead pixels. Lots of sources online for how to do this. The advantage of refurbished is this is taken care of for you.
There are many cheaper options than the Lenovo, depending on where you are located.