Diane Duane has a sale on her personal bundle of everything at her site Ebooks.Direct. Look in the bundle area, for the Whole Store Bundle.
https://ebooks.direct/products/ebook...e-store-bundle
This includes almost everything she has written except all of her tie-in stories, which were probably all works for hire. (She has a bunch of Star Trek novels, and a couple of other IP tie-ins.
The current list looks like it has 32 books plus a couple of short stories for $39.99. All books are DRM free and can be downloaded in several formats.
Note that they say they can't sell to Great Britain and Northern Ireland, due to Brexit problems.
(edit fixed typo)