Answer

If you want to buy printed Jain scriptures/books, the best places I found are JAINA/JainLink Online Store and Jain Publishing Company. JAINA’s store says it has a “Jain Bookstore” and “Jain Books” selection, and Jain Publishing Company is an established publisher that sells books in print and electronic formats. ( jaina.org)

Explanation

If you only want to read Jain texts online, JainKnowledge has a Jain Sutras section, and JEEV Online Library describes itself as an online repository of Jain scriptures and translated Jain books. ( jainknowledge.com)

Spiritual Understanding

For Jain study, it is good to choose an edition that matches your tradition and language preference, especially for Āgams, Sutras, and Stotras. Printed books from Jain-focused publishers are usually the safest starting point. ( jaina.org)

Takeaway

A simple order of preference is:

• Buy: JAINA/JainLink Store, Jain Publishing Company. ( jaina.org)
• Read online: JainKnowledge Jain Sutras, JEEV Online Library. ( jainknowledge.com)