Rose, the (very dark) prequel to
Bone is also
on sale for $5.
Don't be confused by the modern Jeff Smith cover - it's illustrated by Charles Vess.
All the color
Bone volumes are also on sale for $5 each.
https://www.amazon.com/dp/B074C962GB
I got the newer stuff I was missing:
Coda,
Tall Tales, and
Adventures.