Amazon has listed re-releases of the previous Transformers live action movies on Blu-Ray. They each come with a new graphic of some of the main characters from the Micheal Bay films. These are scheduled for release on June 16th, 2017 and are currently listed at $21.99 each.
Unfortunately, the links to these Blu-Ray disks were taken down, but we do have this nice image. Keep an optic out for these!