Shmoop Video on Transformations-but not dilations (2 min)
Instructional Video on Translations, Rotations, and Reflections (9 min)
Transformations Music Video by Mannels Maths Music (2 min) - They say "enlargements" instead of dilations, but they are the same thing.
Video: Explanation of Congruence and Hash Marks on Study.com (You only need the part before it asks you to sign up. You can only watch it once for free.)
Reflections in Geometry on Mathbitsnotebook.com (only the first half of the page applies to what we're covering this year)
Resizing on Mathisfun.com ("Resizing" is another word for Dilation)
TBD