Some places below have quantity discounts.
B and H Publishing
https://www.bhpublishinggroup.com
Bible Surplus
https://www.biblesurplus.com/newtestaments.aspx
Bible Truth Publishers
https://bibletruthpublishers.com/
Bibles at Cost
Bibles in Bulk
Bibles.com
Christianbook
Church Source
https://churchsource.com/collections/church-outreach-bibles
Ebay
You may find used New Testaments and Bibles here. This is one of the best places to find low price Bibles and New Testaments.
Equipping the Saints
Faith Gateway
https://faithgateway.com/search?q=bulk
Lifeway
https://www.lifeway.com/en/shop/bibles/pew-bulk-bibles/outreach-and-new-testament-bibles
Operation Somebody Cares
http://www.operationsomebodycares.com/
Gospel of John and Romans, Gospel of Romans
The KJV Store
https://www.thekjvstore.com/articles/wholesale-bibles/
Used Book Stores
In the past, I would see Bibles and New Testaments at these places for a very good price.
World Missionary Press
Scripture booklets