Looking at the list of textbooks posted on the College's website, it appears that all of the required textbooks are the same edition as the 1L textbooks last year. As long as you confirm the editions (there may be some 3L's that will be selling their 1L texts that are older editions), then you will be fine. I would suggest selecting textbooks that have minimal highlighting as some law students are heavy-handed when it comes to highlighting. Excessive highlighting by others can make it challenging to determine what elements of the cases are essential to you. New texts will cost you about $1000-$1500 depending on if you get all the supplementary or not, so used is a great option IF you match the editions. I would highly recommend against getting older editions as students in my year did that, and they often were missing cases or had to spend additional time figuring out the right pages.
Edit: You will want to buy the 2020 Criminal Code as the 1L's from last year would have used the 2019.