If you want a copy of the 2011 revised edition of the
New International Version, this might be the least expensive one that you can get right now. It's currently
99 cents at Christianbook.com.
It is marketed by Zondervan as the
Lifehacks Bible: Practical Tools for Successful Spiritual Habits. You may not be interested in the additional, "Lifehacks" features of this special edition, but you will have the newest edition of the NIV.
The initial edition of the NIV was published in 1984. A revision in 2005 (complete Bible), called
Today's New International Version, made several changes, most notably, perhaps, the inclusion of gender-neutral language. The edition was not particularly well received, and in 2011 a new edition was released. In some ways it was a step back toward the original, 1984 edtion, most notably in dropping the gender-inclusive language introduced with the TNIV.
The link.