Sites like Editura Basilica may offer digital editions of their printed bibles.
An Orthodox Bible is not a 66-book Protestant canon. It includes the holy books of Tobit, Judith, Wisdom of Solomon, Sirach (Ecclesiasticus), Baruch, and 1-4 Maccabees, plus additions to Daniel and Esther. Many "cheap" PDFs omit these entirely. A better PDF includes the full canon. biblia ortodoxa pdf better