The New Oxford Annotated Bible with Apocrypha is on sale for $13.25 at
Amazon and
Google.
This is one of the best academic study Bibles and I highly recommend it, but be aware that Amazon version is AZW4 ("Print Replica"), which is a repackaged PDF (you can actually extract the PDF if you have both Alf's tools and the KindleUnpack plugin installed in Calibre). Amazon also doesn't even allow it to be downloaded to e-ink Kindles (tablet or desktop only).
Also be aware that Google's is PDF only and their PDFs are often re-rendered as images rather than text. I don't know if they have in this particular case, but if you're comfortable with Calibre plugins, I'd recommend buying from Amazon. As a sort of bonus, the extracted PDF actually has a full table of contents embedded that isn't usable by the Kindle software, for some reason. If you're considering doing this and haven't before, I'd further recommend that you download the sample (which is also AZW4) and practice on that.
Amazon's regular price is around $19, but it occasionally drops by a dollar or two. This is the cheapest I've seen. Other than Google and Amazon, the only place I've seen it available is
ebooks.com, where it's $33.99.