Mike,
I think this is specifically for Black Friday and Blu-ray deals.
In the past (though not in the past two years), Amazon actually listed those BF deals far in advance
Dick,
You are not alone. I generally won't pay a premium for 3D releases either unless I really want them on day one.
These days, $24.95 is generally what I'll pay, but often, I will wait for a title to reach $19.95 which is rare unless you want to wait a long time.