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:

Click here for the SI Online Bookstore (Operated by MBS Direct) - Open August 2, 2019

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

Course Readers and PE Uniforms -  Sold in the On-Campus SI Bookstore

PE uniforms will be sold during class at the beginning of each semester. The PE teachers will provide instructions. You may make additional purchases later during the SI Bookstore's regular hours.

The following courses have required Course Readers.

IMPORTANT: If you are enrolled in one of these courses, plan to make your purchases during Orientation / Registration on August 18 or August 22. Additional hours will be limited.

  • AP Latin
  • English 100 & 103H (Freshman English)
  • English 200 & 203H (Sophomore English)
  • English 300 & 303H (Junior English)
  • Fnd of Ethics RS 300 (Junior Religious Studies)
  • Latin 1
  • Latin 2 & 2H
  • Rel Studies 475 (Sports & Spirituality)

SI On-Campus Bookstore Hours - Fall 2019 - Spring 2020

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

Open during Orientation / Registration:

  • Sunday, August 18  12 NOON - 3:30 PM
  • Thursday, August 22 10:00 AM - 3:00 PM

Extended Hours During First Week of Classes Before/After School and Lunch:

  • Friday, August 23  7:45 AM - 8:15 AM and both Lunch Periods
  • Monday - Thursday, August 26 - 29  7:45 AM - 8:15 AM and 2:30 PM - 3:15 PM

Regular hours during the school year:

Tuesday 11:00 AM - 4:00 PM

Thursday 11:45 AM - 4:00 PM

We accept cash / check / MasterCard / Visa (NOT AmEx or Discover) / MySchoolBucks.

Next Textbook Buyback - Spring 2020

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.