If you want to buy the Gospel of John by itself, below are places that sell it.
Amazon.com
Bearing Precious Seed
This ministry has low price materials. They print and distribute the Gospel of John and Romans together. They print about 30 to 40 languages. Please click on the link distribution on the home page to see what languages are available for the Gospel of John.
Bibles at Cost
Bibles At Cost offers the best-selling Bibles at the lowest prices in America. Their low prices are available in bulk or individual quantities or orders. To search for the Gospel of John, just type "John" or "Gospel of John" on their search engine.
Bibles in Bulk
Bibles in Bulk works closely with a number of publishers to be able to offer great deals on a wide selection of Bibles and other products in bulk quantities. Our goal is to make purchasing bulk products affordable and easy. We are excited to partner with each of you as you use these materials to further spread the Gospel.
Christianbook.com
http://www.christianbook.com/bibles
Christianbook.com is an online store that sells many Christian materials particularly Bibles. The Gospel of John can be bought from this online store. Use their search engine to look for different booklets or books on the Gospel of John. Please type the keyword "John".
Church Source
ChurchSource is dedicated to providing trusted resources to pastors & churches to equip you, your team, and your congregation for your mission!
Evangelism Explosion International
http://evangelismexplosion.org/
This place sells the Gospel of John.
Gospel of John: Behold the Lamb of God
http://bibletruthpublishers.com/kjv-gospel-of-john-behold-the-lamb-of-God/king-james-version/pd1456
http://bibletruthpublishers.com
This booklet is very inexpensive and can be easily carried in your pocket. It features 10-point and single-column paragraph style text with superscript verse numbering. It concludes with a 2-page gospel message on the Lamb of God. Version used is KJV. Size: 3.5" x 5.5" x .1"
Gospel of John - Pocket Edition
This attractive pocket-size Gospel of John with helps, stressing the value and power of the Scriptures, gives a portrait of Christ as found in the Gospel. It presents an excellent salvation message and is good for general distribution.
KJV Pocket Gospel of John: Gold Frame Cover
You can buy this pocket-sized Gospel of John at Koorong.com. The book is in paperback and contains 62 pages. The price of each booklet is affordable.
Lifeway
Lifeway was formed by the Southern Baptist Convention for the purpose of publishing resources for the church. The SBC is a collection of like-minded churches working in cooperation with one another to impact the whole world with the Good News of Jesus Christ.
Living Water: The Gospel of John
At this website you may request for a free copy of the booklet "Living Water: The Gospel of John.
Moments with The Book
Moments with The Book is a non-profit organization whose purpose is to spread God's Word to the world through the printed page and other media. Our desire is that the Lord will be glorified in the salvation of precious souls and the strengthening of believers in the Christian faith as a result of reading the Scripturally-sound literature which Moments with The Book produces and distributes.
The KJV Store
THe KJV Store sells the KJV version of the Holy Bible. To search for the Gospel of John (KJV) booklets, please use their search engine located at the left side of their webpage. Type the keywords "Gospel of John."
Trinitarian Bible Society
Trinitarian Bible Society sells Bibles at a very low price. They sell new and slightly used Bibles. Please check their catalog for the list of Bibles they currently have. Sometimes, they receive books and booklets of the Gospel of John and they put these on sale in their online store.
The Pocket Testament League
Pocket-sized Gospel of John has made it easy to carry God's Word with you wherever you go, to share anywhere. The Gospel of John is available in different cover designs to give away to others. Look for the Gospel of John under the link Pocket Gospels.
World Missionary Press
http://www.wmpress.org/index.shtml
The World Missionary Press distributes Scripture booklets around the globe. They have A Bible Study on John (Read A Booklet >> Booklets Available). This Bible study guide is available in different languages. You can also request for them to print or send you the Gospel of John booklet for your own use or for ministry use.
Walmart