The big reason that I like Crossway's store is that, in addition to being DRM-free, you can download both Mobi (Kindle) and EPUB formats with the same purchase.
Other Bibles that are available for free:
The Holman Christian Standard Bible is available as a DRM-free EPUB from the publisher. It's also free at Amazon for the Kindle.
The New World Translation can be downloaded as DRM-free EPUB or PDF from Watch Tower.
The KJV can be downloaded from
the LDS (Mormon) website along with
The Book of Mormon,
Pearl of Great Price and
Doctrine and Covenants. The EPUB and Mobi versions are pretty lackluster (no paragraphs, limited navigation, no notes), but the PDFs are well-done, searchable scans of the printed versions.
It's also worth noting that a number of translations are available at Kobo for less than $10 even when not on sale and with the 30%-35% off codes that are available, come in at around $5.
The Living Bible for $9.39 (or $6.57 at 30% off)
NKJV,
NCV,
GOD'S WORD Translation and
CEB are all $7.69 ($5.38 at 30% off).
Lockman's NASB is cheap at Amazon and Christianbook, but the formatting is awful and it doesn't have footnotes. If you really want the NASB, you're better off springing for one of the study Bible editions.