Can't speak of any other schools but only the campus in Anguilla. I don't think there was an MD1 class this semester at the other campus so you may not have much luck with the PDF's from previous classes. I study well with PDF's so I didn't waste any time nor money buying any books. I know here at Anguilla they have this program called cover to cover which allows students to rent books for cheap like 10 dollars per book for the entire semester. I would invest in the USMLE first aid and bring it down with you. That's about it.

Good Luck! 

Mario