Some Andre Norton collections appear to be on sale today.
Witch World: High Hallack Cycle is $5.99, and includes
The Jargoon Pard,
Zarsthor's Bane,
The Crystal Gryphon, Gryphon in Glory, and
Horn Crown.
https://www.amazon.com/dp/B07GQLD8TX
Along with that,
The Magic Sequence Volume Two is also on sale $3.99, and includes
Dragon Magic,
Lavender-Green Magic, and
Red Hart Magic.
I have not read any of Mrs. Norton's books, but I feel like I should. Maybe I will start with one of the free ones available from Kobo:
https://www.kobo.com/us/en/ebook/star-soldiers
https://www.kobo.com/us/en/ebook/time-traders