It sucks, but search for used versions of those books. As long as you're willing to wait a week or two, you can often get used books internationally for <10 dol

It sucks, but search for used versions of those books. As long as you're willing to wait a week or two, you can often get used books internationally for <10 dollars. Also ask your professors if they can share relevant parts of the books they use. Many countries outside the English-speaking world have partial copyright exemptions for education. A last resort may be to ask professors whether they can apply for evaluation copies. Publishers often give free copies to educators so they can evaluate books for their curriculum. Sadly, it's mostly digital versions today.