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SI Online Bookstore (Operated by MBS Direct)


The on-campus SI Bookstore sells course readers and PE uniforms only. All textbooks, eBooks and paperback fiction are sold at the SI Online Bookstore (Operated by MBS Direct) at the following link.  (Not all courses have required textbooks. If a course is not listed on the SI Online Bookstore, the teacher will provide details regarding materials that will be used instead.)

Click here for the SI Online Bookstore (Operated by MBS Direct) - Open June 2 for Summer Session Only - Open July 31, 2023 for Fall 2023 

IMPORTANT:  PARENTS MAKING PURCHASES - If ordering digital items, be sure to enter the student's SI email address in the step that allows the entry of the student's own email address. Do NOT use your parent email address for this step.

Note: Your transaction will be with MBS Direct. The SI Bookstore is not involved. If you have any technical or ordering questions, contact Customer Service at MBS Direct at 1-800-325-3252 or email

Accessing Digital Books - Tips For Students - Click Here

Digital vs. Printed Books - Pros and Cons - Click Here

Course Readers

The following courses have required Course Readers.

IMPORTANT: If you are enrolled in one of these courses, course readers will be distributed during Orientation / Registration  (Dates Below).

  • English 300 & 303H (Junior English) - Thursday, August 17 (During Registration)
  • Fnd of Ethics RS 300 (Junior Religious Studies) - Thursday, August 17 (During Registration)
  • Latin Readers - distributed in class by the teacher
  • Rel Studies 475 (Sports & Spirituality) Readers - distributed in class by the teacher

SI On-Campus Bookstore Hours

(Only for Course Readers. For textbooks, eBooks, and paperback fiction, use SI Online Bookstore above.)

Closed for the Summer

During Orientation / Registration:

  • Junior English and Religious Studies Readers will be distributed during Registration on Thursday, August 17.

Regular Hours During the School Year:

  • TBD

We accept MasterCard / Visa (NOT AmEx or Discover) / MySchoolBucks (Student ID required). NO CASH OR CHECKS.


Current Textbook Buyback - Spring 2023


MBS Direct Online Textbook Buyback

This year's Textbook Buyback will be a self-service online buyback, offered by MBS Direct via the SI Online Bookstore. Please follow the Instructions at the following link:

Click here for Buyback instructions.

Click here for the Online Buyback site: 


Note: The buyback transaction is strictly between you and MBS Direct. SI and its Bookstore are not directly involved in the transaction. For questions or customer service, contact MBS Direct at 1-800-325-3252 or email 

For more information on the SI Bookstore, please contact Mr. Mike Ugawa.