Why Amazon.com is NOT dealing with “Batman 1960s Seasons 1-3 All 120 episodes 7 DVDs” ?”
The studio has not released any such thing. The sites you’re looking at are selling illegal bootleg copies. For example: http://www.tvdvdworld.tv/movie/action/Batman_1960’s.html Look at the information provided: “Custom artwork”, “region-free”, no commentary or other special features. These are all indications of bootleg merchandise. By the way, that “custom artwork” is a direct copy of the cover of the Batman Movie (the one based on the 60’s series), which is an official release.