PSI MEMBERSHIP BENEFITS
NEW! MEMBER DISCOUNTS!
BOOKS for sale at 15% off LIST PRICE with purchase of 2 or more books.
USE Discount Code: PSIDISCOUNT
FREE SHIPPING ANYWHERE IN THE WORLD!
Membership has it’s advantages. PSI offers immediate member discounts on the purchase of books from our preferred stockists.
Currently we have an arrangement with our friends at STAIRWAY PRESS for discounted book purchasing. PSI members who buy two or more books get a 15 percent discount PLUS FREE SHIPPING! Enter this code at checkout: PSIDISCOUNT
Contact us for a full list of publications. No-obligation!
Join Principia Scientific International today and start making savings on your online book purchases.