The John Wilson Group creates the Consumer's Guide to Hearing Aids and updates it yearly. They also create other health guides including one about tinnitus. 

They offer the guide in print and also as an online version. The structure for the guide has changed for 2021. 
 
"As far as pricing goes, our structure has changed for 2021. Printed guides and downloads are now the same price (60 = $420; 120 = $825.60, etc. (cost per guide goes down with each additional quantity of 60 purchased))."

To order the guides in bulk you can contact Cory Johnson: cory.johnson@.../