To be honest, I don't see how you can have a course without books. It's understandable if it is not an expense you want to take on, but also understandable that you need books to take a course.
Also, if you call the Yale Coop, they may have used books. Harvard Coop is more dicey, their bookstore is now Barnes and Noble. Try the MIT branch.
I stopped buying new books after my freshman year (not at Yale, G-d forbid)!
Dx: Bipolar 1; GAD; Migraine w/ Aura; Migraine w/o Aura; Status Migrainosus
Rx: Alprazolam; Botox; Buproprion; CoQ10; Dihydroergotomine via IV Infusion; Flexeril; Green Coffee Bean Extract; Lamotrigine; Lithium; Magnesium Chloride; Metoclopramide; Midrin; Migranal; Prilosec; Promethazine; Riboflavin; Verapamil; Vitamin D3
Currently Shelved: Abilify; Amerge; Anaprox; Atenolol; Buspar; Cafergot; Cymbalta; Depakote; Di-Hydro-ergotamine, injected; Gabapentin; Geodon; Imitrex Tablets; Klonopin; Maxalt; Namenda; Nortriptyline; Norvasc; Propranolol; Prozac; Risperidone; Relpax; Sansert; Sumatriptan injectables; Tegretol; Trazadone; Zoloft; Zolpidem; Zomig; Zonegran
Affectations can be dangerous. -Gertrude Stein
You can't fool me. There ain't no sanity clause. -Chico Marx