Baylor University Press is currently offering 50% off all their backlist titles for grad students with a .edu address. At Words on the Word I’ve reviewed the title above, as well as the Malachi Hebrew handbook.
To get the discount, you’ll need to sign up here, using your .edu email address. Sign-ups are open through June 12. Baylor sends the discount code June 13. Then you can apply the discount code to orders placed from June 14-18.
Baylor Press’s site is here.
Words on the Word 
What do you mean by backlist titles?
I’m not sure what exactly the cutoff is, but backlist titles are anything that is not a new release.