The Extra Sugar does have a minimum price of $2.50 USD, has over 480 images (150 mb). And includes this additional content:
unposted studies
unfinished sketches
added context in the canon section, as well as annotations on some of the art regarding characters or my process
Process collages for select finished pieces.
And the thumbnails and sketches for the start of an unfinished (au) comic, (Featuring Doggy Doros! Yay!)